Geometry Terms

adjective describing something that is next to or adjoining something else

• The building adjacent to the park is a historical landmark.
• The house next to the school is the one with the blue shutters.
• I live in the house right next door to the party.
• The two ideas are closely adjacent in meaning.

noun the highest point of achievement or success

• The mountaineer finally reached the apex of the mountain after days of climbing.
• I heard the new restaurant at the apex of the city has amazing views.
• That party was at the apex last night, everyone was there.
• Reaching the apex of his career, he was now considered a top expert in the field.

noun a point or part that is equally distant from all sides, edges, or ends; the middle

verb to place in or adjust to a central position

adjective located in the middle; central

adverb in or toward the middle

• The research center is dedicated to advancing scientific knowledge.
• Let's meet at the shopping center later.
• I heard there's a new skate park at the rec center.
• She is the center of attention wherever she goes.

noun a round shape that has no beginning or end

verb to move in a circular path or shape

• The students sat in a circle for their discussion.
• Let's all sit in a circle and chat.
• We made a circle to gossip about the latest drama.
• She felt like she was going in circles trying to solve the problem.

noun a printed or written advertisement, letter, or document distributed to a large number of people

adjective relating to or forming a circle; round in shape

• The circular motion of the planets around the sun is a key aspect of our solar system.
• Can you pass me that circular plate over there?
• I love wearing my circular shades when I go to the beach.
• The circular nature of life's ups and downs is both frustrating and fascinating.

adjective describing or relating to the circumference of a circle or other rounded figure

• The circumferential measurement of the circle was calculated to be 10 meters.
• I walked around the circumferential path of the park for exercise.
• Let's take a shortcut through the circumferential route to save time.
• The circumferential nature of the problem required a comprehensive solution.

noun a solid or hollow object that tapers from a circular or roughly circular base to a point

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• The ice cream vendor handed me a cone with two scoops of vanilla ice cream.
• I grabbed a cone of fries to snack on while waiting for the movie to start.
• Let's hit up the ice cream shop and grab a cone before heading to the beach.
• The mountain peak resembled a cone, towering over the surrounding landscape.

adjective having a shape that is not straight or flat, but instead has a smooth, rounded surface

• The architect designed a building with a beautifully curved facade.
• She has a curved mirror in her room that makes everything look funny.
• I love how my new skateboard has curved edges for better control.
• His argument took a curved path, eventually leading to a surprising conclusion.

noun a straight line that is sloping and not horizontal or vertical

adjective slanting or oblique; not horizontal or vertical

• The architect drew a diagonal line to represent the slope of the roof.
• She cut the cake into diagonal slices for easy serving.
• I saw him take a diagonal shortcut through the park.
• Their relationship took a diagonal turn when they started working together.

verb past tense of the verb 'dot', which means to mark with dots or spots

adjective describing something that has dots or spots

• The map was covered in dotted lines indicating different hiking trails.
• She wore a cute dress with a dotted pattern.
• I love those sneakers with the dotted design, they're so cool.
• His memory of the event was like a dotted line, with gaps and missing pieces.

adjective describing something that is at an equal distance from two points

• The two points are equidistant from the center of the circle.
• The two buildings are equidistant from the park.
• We need to find a spot that's equidistant from all of our houses.
• Her love for both her children is equidistant and unwavering.

noun a horizontal line, plane, or position

adjective relating to or situated in a plane parallel to the horizon

• The architect designed the building with a strong emphasis on horizontal lines.
• I prefer my photos to be horizontal rather than vertical.
• Let's hang that picture up horizontal, it looks better that way.
• She tried to stay on a horizontal path in life, avoiding any major ups and downs.

verb to write or carve words or symbols on a surface

adjective written or carved on a surface

• The names of the fallen soldiers were inscribed on the memorial wall.
• I got my initials inscribed on my new watch.
• We inscribed our group name on the back of our t-shirts.
• Her kindness was inscribed in everyone's memory.

adjective relating to or involving mathematics

• The mathematical equation was complex and required advanced problem-solving skills.
• I struggle with mathematical concepts, but I'm working on improving my skills.
• Mathematical stuff always gives me a headache, but I manage to get through it.
• In the grand scheme of things, life is like a mathematical puzzle waiting to be solved.

adjective slanting or sloping in direction or position; not straightforward or direct

• The oblique angle of the sun cast long shadows across the field.
• She gave me an oblique glance before turning away.
• I could tell by his oblique response that he didn't want to talk about it.
• Her oblique approach to problem-solving often led to creative solutions.

noun a type of angle that is greater than 90 degrees but less than 180 degrees

adjective not quick or alert in perception, feeling, or intellect; not sensitive or observant; dull

• The student struggled to understand the obtuse angles in geometry class.
• I don't get why he's being so obtuse about the situation.
• Stop being so obtuse, just tell me what's really going on.
• Her obtuse behavior towards her friends eventually caused a rift in their relationship.

noun a line or plane that is perpendicular to another line or plane

adjective forming an angle of 90 degrees with another line or surface

• The two lines are perpendicular to each other, creating a right angle.
• The sign is supposed to be perpendicular to the ground, not tilted.
• Make sure you park your car perpendicular to the curb.
• Their opinions were perpendicular, causing a heated debate.

noun a mathematical constant representing the ratio of a circle's circumference to its diameter, approximately equal to 3.14159

• The value of pi is approximately 3.14159.
• I can never remember the exact value of pi.
• I heard that guy can recite pi to 100 decimal places!
• She has a memory like pi, always remembering details.

noun a solid geometric figure with two parallel and congruent faces called bases, and all other faces are parallelograms

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• The scientist used a prism to separate the different wavelengths of light.
• I love how a prism can create a rainbow effect when light passes through it.
• Check out this cool prism I found at the store, it makes everything look trippy!
• Her perspective on the situation was like looking through a prism, seeing multiple angles at once.

noun a square or rectangular area

verb to make square or rectangular

adjective square or rectangular in shape

• The biologist studied the quadrate bone in the skull of the animal.
• I heard that the quadrate bone is important for jaw movement.
• Check out the quadrate on that dude, it's massive!
• Her ability to multitask is like a quadrate puzzle, fitting everything together perfectly.

noun a plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square

adjective having the shape of a rectangle; having four straight sides and four right angles

• The architect carefully measured the dimensions of the rectangle before designing the building.
• I need to buy a new rug for the living room, preferably in a rectangle shape.
• Let's grab a table in the back, it's a rectangle so we can all fit.
• Her life felt like a never-ending loop, going around in a rectangle with no way out.

noun the act of rotating or the state of being rotated

verb to turn or move in a circle or around an axis

• The Earth rotates on its axis once every 24 hours.
• Make sure to rotate the mattress every few months to keep it in good condition.
• I'll rotate the crops in the garden to ensure they all get enough sunlight.
• It's important to rotate your study habits to keep your mind engaged and refreshed.

verb past tense of 'round', meaning to make something into a shape that is smooth and curved

adjective describing a shape that is smooth and curved, rather than with sharp angles

• The architect designed the building with rounded edges for a more modern look.
• I like how the new car has rounded headlights, it looks so sleek.
• That pizza place makes the best rounded crusts, you have to try it!
• Her rounded personality makes her easy to get along with.

noun the quality or state of being round

• The roundness of the table makes it a perfect choice for small gatherings.
• I love the roundness of this cake - it looks so delicious!
• Check out the roundness of that car's wheels - they're massive!
• The roundness of her cheeks gave her a youthful appearance.

adjective describing a shape that is half of a circle; having the shape of a semicircle

• The semicircular arches of the cathedral were a stunning example of Gothic architecture.
• The semicircular driveway makes it easy to pull in and out of the house.
• I love how the semicircular stage gives the performers room to move around.
• Her smile was like a semicircular rainbow, brightening up the room.

noun a geometric figure such as a square, circle, or triangle

verb to give a particular form or appearance to; to mold or make

adjective having a particular form or appearance

• The artist carefully studied the shape of the sculpture before beginning to carve.
• I'm trying to get back in shape before summer hits.
• That new car has a sleek shape that really stands out.
• Her words took shape as she began to articulate her thoughts.

verb taking a side or position in a debate or conflict

• The two-sided agreement was carefully reviewed by legal experts.
• I like that double-sided poster you have hanging in your room.
• I heard she's two-sided when it comes to making decisions.
• His two-sided personality makes it hard to know what he truly thinks.

noun a sloping position or direction

verb to lean or incline in a particular direction

adjective having a bias or tendency in a particular direction

• The article presented a slant on the political issue that favored one side over the other.
• I noticed the news report had a slant towards the company that sponsored it.
• I can't trust that website, they always have a slant on the stories they cover.
• Her opinion on the matter had a noticeable slant towards her personal beliefs.

noun a plane figure with four equal straight sides and four right angles

verb to make something square in shape or to be at right angles

adjective having the shape or form of a square; having the form of a right angle

• The architect designed a building with a large square courtyard in the center.
• Let's meet at the coffee shop on the town square.
• I can't believe he squared up with that guy after the argument.
• She always tries to fit a round peg in a square hole, refusing to accept things as they are.

adjective having a shape or cross-section that is square or approximately square

adverb in a direct or straightforward manner; firmly or solidly

• The company's new policy squarely addresses the issue of workplace harassment.
• I told him squarely that I didn't appreciate his rude comments.
• She squared up to her bully and told them to back off.
• His actions squarely placed the blame on himself for the project's failure.

noun a form or object that has length, width, and depth

adjective describing a form or object that has length, width, and depth

• The architect presented a detailed plan of the building in three dimensional form.
• I love watching movies in 3D, it feels so real!
• The video game graphics are so cool, it's like playing in 3D!
• Her storytelling skills are so vivid, it's like she can bring characters to life in a three dimensional way.

noun a four-sided figure with at least one pair of parallel sides

adjective describing or relating to a trapezoid

• The trapezoid is a quadrilateral with at least one pair of parallel sides.
• I struggled to remember the properties of a trapezoid for my math test.
• That trapezoid shape is so weird, it looks like a lopsided rectangle.
• Her thoughts were like a trapezoid, with some ideas parallel and others diverging.

noun a closed plane figure having three sides and three angles

adjective relating to or shaped like a triangle

• The architect used a compass and ruler to accurately draw a triangle on the blueprint.
• I can never seem to draw a perfect triangle freehand.
• That guy's haircut makes his head look like a triangle.
• The love triangle between the three coworkers caused tension in the office.

adjective having various forms or shapes

• The variform shapes of the crystals were carefully studied by the scientists.
• The artist loved experimenting with variform designs in her work.
• I can't decide which variform outfit to wear to the party.
• The variform opinions of the group made it difficult to come to a consensus.

noun a book forming part of a work or series

verb to turn up or increase the volume of sound

adjective relating to sound production or reproduction

• The volume of the container is measured in cubic meters.
• Can you turn up the volume on the TV?
• I can't hear you, can you pump up the volume?
• The volume of complaints from customers has been increasing lately.

noun a piece of wood, metal, or some other material having one thick end and tapering to a thin edge, that is driven between two objects or parts of an object to secure or separate them

verb to fix in position using a wedge

adjective having the shape of a wedge; wedge-shaped

• The chef used a wedge of lemon to garnish the dish.
• Can you pass me that wedge of cheese, please?
• I love wearing my wedge sneakers, they're so comfortable.
• The political scandal drove a wedge between the two parties.

adjective having a pattern or arrangement in which things spiral around a central point

• The leaves of the plant were arranged in a whorled pattern along the stem.
• I noticed the whorled design on the shell of the snail.
• Check out the cool whorled pattern on this seashell!
• Her thoughts were whorled, swirling around in her mind without clarity.

noun a polygon with ten sides and ten angles

• A decagon is a polygon with ten sides and ten angles.
• Have you ever tried drawing a decagon? It's pretty challenging.
• That decagon shape looks like a funky stop sign.
• The team's defense formed a decagon around the goal, making it nearly impossible for the opponent to score.

verb to sharpen or make more acute

adjective sharp or keen in perception or intellect

• The acuate angle of the triangle measured exactly 90 degrees.
• She drew an acuate line on the paper to make sure it was straight.
• I acuated my way through the crowded room to get to the front.
• His acuate reasoning led him to the correct conclusion in the end.

noun a term that refers to a geometric concept, specifically the line segment connecting the center of a circle to any point on its circumference

• The engineer calculated the adradius of the circle to determine its size.
• I have no idea what adradius means, can you explain?
• I heard that guy has a huge adradius, must be good at math.
• Her adradius of influence extended far beyond her immediate circle of friends.