Radius, Diameter, Circumference, and Area of Circles - dummies
https://www.dummies.com/article/academics-the-arts/math/trigonometry/radius-diameter-circumference-and-area-of-circles-149304/
WebJul 7, 2021 · The diameter is always twice the radius, so either form of the equation works. Similarly, the formula for the area of a circle is tied to π and the radius: Area of a circle: A = πr2. This formula reads, “Area equals pi are squared.” Find the radius, circumference, and area of a circle if its diameter is equal to 10 feet in length.
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