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Q: How do you find the radius of a circle if you dont know the circumference?

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find the radius of a circle with circumference of 42.1

For a circle, circumference = 2 x pi x radius.

Circumference of a circle = 2*pi*radius

A circle with a radius of 8 inches has a circumference of 50.27 inches.

The radius of a circle is the distance from its centre to its circumference. If a circle has a radius of r units then the length of its circumference is 2*pi*r units.

The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.

Circumference = 2*pi*radius So the radius = circumference/2*pi

Circumference of a circle = 2*pi*radius or diameter*pi

Circumference of a circle = 2*pi*radius Circumference = 2*pi*5.6 = 35.18583772 units

Circumference = 2 x pi x radius = 31.4159

Circumference of a circle = 2*pi*radius = 8*pi or 25.13274123 units

Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared

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