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Radius
Circle Basics![Play](https://cdn-wordup.com/WebsiteImages/DictionaryPics/BlackPlay.svg)
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.
Measure Twice![Play](https://cdn-wordup.com/WebsiteImages/DictionaryPics/BlackPlay.svg)
Always double-check the length of a radius, as even a small error changes the circle size significantly. ![Slide](https://word-images.cdn-wordup.com/tips/tIIR5ZjlqRygZimCdsDuUt97nC4.webp)
Not a Diameter![Play](https://cdn-wordup.com/WebsiteImages/DictionaryPics/BlackPlay.svg)
Do not confuse radius with diameter; the radius is half the length of the diameter. ![Slide](https://word-images.cdn-wordup.com/tips/XmdH9KP1NkgbrefWzPR1wvduk.webp)