Q: What is the radius of a 20 cm circle with a quarter cut out?

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20; the diameter of a circle is twice its radius.

A circle with a radius of 20 yards has an area of 1,256.64 square yards.

Circumference of a circle equals Pi times the double the radius C = 2 x 3.14 x radius C= 2 x 3.14 x 20 C = 125.6 The circumference of a circle with a 20 foot radius is 125.6 feet.

10 cm

You double the radius.. if the radius is 10 the diameter is 20.

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20; the diameter of a circle is twice its radius.

The radius of this circle is 10 units.

A circle with a radius of 20 yards has an area of 1,256.64 square yards.

That depends what you mean with "a 20 cm. circle". If 20 cm. is the radius, you already have the answer. If 20 cm. is the diameter, the radius is half the diameter. (10cm)

The radius is 3.183

A circle with a radius of 20 yards has an area of 1,256.64 square yards.

Radius of a circle with 20' circumference = 20'/2pi = 3.18'Area of a circle with 3.18' radius = ((3.18')^2)pi = 31.8 square feet

10 cm

Circumference of a circle equals Pi times the double the radius C = 2 x 3.14 x radius C= 2 x 3.14 x 20 C = 125.6 The circumference of a circle with a 20 foot radius is 125.6 feet.

20 mm. The diameter is always twice the radius.

The radius of a circle whose circumference is 40pi is 20 units.

radius = 20/(2*pi) = 3.183098862 inches