what is the radius of a circle

The radius of a circle is the distance from the center of the circle to any point on its circumference.

Quick Scoop

• If you know the diameter ddd, then the radius r=d2r=\frac{d}{2}r=2d​.

• If you know the circumference CCC, then r=C2πr=\frac{C}{2\pi}r=2πC​.

• If you know the area AAA, then r=Aπr=\sqrt{\frac{A}{\pi}}r=πA​​.

In everyday terms, imagine drawing a circle with a compass: the radius is the fixed length from the sharp point (center) to the pencil tip (edge of the circle).

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