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Radius

usgb/ˈreɪdiəs/Volume
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Circle Basics

A radius is essential in geometry for calculating area and circumference of a circle.

Find the area of a circle by using the radius in the formula Area = πr^2.
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Measure Twice

Always double-check the length of a radius, as even a small error changes the circle size significantly.

Illustration for Measure Twice
She carefully measured the radius again before cutting the round cake board.
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Not a Diameter

Do not confuse radius with diameter; the radius is half the length of the diameter.

Illustration for Not a Diameter
The diameter is twice the radius, so if the radius is 4 cm, the diameter will be 8 cm.
Visual representation of the word "Radius"

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