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Q: How many inches is the circumference of a circle if its radius is 21 inches?

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you have to quote the diameter or radius or circumference of the circle to calculate the area. If diameter 78.53. If radius 314.15. If circumference 7.95

It is: circumference/radius = 2*pi

The circumference is about 131.9 inches. (C = r x 2 x Pi)

All depends what you mean by 18 inches, is that the circumference, the diameter or the radius

The circumference of a circle, with a diameter of 12 inches, is 37.7 inches.

Circumference = 2*pi*radius or pi*diameter Circumference = 36pi inches

Area of a circle: pi*radius*radius

The circumference of an 8 inch circle is: 25.13 inches(diameter x Pi = circumference).

Yes, providing that they stem from the center of the circle to its circumference.

Area of circle is pi*radius*radius. hence area of 1.5 inch circle is 7.065 square inches.

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

8 times

Circumference of a circle = 2piradius or pi*diameter

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

If the area is a circle and the radius of the circle is 21 miles, the distance around the circle (circumference) is 131.95 miles. The area of that circle is 1,385.4 square miles.

circumference = 17pi inches

(6 pi) inches.

Area of circle in square inches = pi*radius squared

A radius is not a specific unit of measurement - the radius of a circle is the measurement from the centre of the circle to any line on the circle's circumference. The word "radius" is derived from the Latin word for "ray" but was also used to refer to the spoke of a chariot wheel.

The inches in a diameter = 2 X inches in the radius. Or, inches in a diameter = inches in circumference / pi

Infinity because the circumference of the circle is the same as the circumference of the sphere.

Area of a circle: pi*radius squared

The answer will depend on whether you require the radius, diameter or circumference.The answer will depend on whether you require the radius, diameter or circumference.The answer will depend on whether you require the radius, diameter or circumference.The answer will depend on whether you require the radius, diameter or circumference.

You should say if the 9 feet is a radius, diameter or circumference.....if radius then 254.47 feet

The diameter of a circle is twice the radius.The diameter of a circle is twice the radius.The diameter of a circle is twice the radius.The diameter of a circle is twice the radius.