Radius

Pronunciation: /ˈreɪdiəs/

Definitions of radius

noun the length of this line

Example Sentences

A1 The radius of a circle is the distance from the center to any point on the edge.

A2 To find the area of a circle, you need to know the radius.

B1 The radius of the Earth is approximately 6,371 kilometers.

B2 The radius of a sphere is half of its diameter.

C1 In geometry, the radius is a line segment that joins the center of a circle to any point on its circumference.

C2 The radius of a black hole is so strong that not even light can escape its gravitational pull.

Examples of radius in a Sentence

formal The radius of the circle is calculated by measuring the distance from the center to any point on the circumference.

informal You can find the radius by measuring from the middle to the edge of the circle.

slang The radius is just the distance from the center to the outside.

figurative In life, our comfort zone can be like a radius limiting our experiences.

Grammatical Forms of radius

• past tense: radiused
• plural: radii
• comparative: more radius
• superlative: most radius
• present tense: radius
• future tense: will radius
• perfect tense: has radiused
• continuous tense: is radiusing
• singular: radius
• positive degree: radius
• infinitive: to radius
• gerund: radiusing
• participle: radiused

Origin and Evolution of radius

First Known Use: 1651 year

Language of Origin: Latin

Story behind the word: The word 'radius' originated from Latin, where it referred to a spoke of a wheel or a ray of light.

Evolution of the word: Over time, the word 'radius' expanded its meaning to include the line segment connecting the center of a circle to any point on its circumference, as well as the bone in the forearm that extends from the elbow to the wrist.