The calculation of the radius of a circle is expressed by the equation r = C / 2 * pi. This is where r is the radius, C is the circumference and pi is the irrational number beginning with 3.14.

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A circle with a diameter of 8 inches has a radius of 4 inches. To find the radius of a circle based on a given diameter, divide the diameter by 2. Consequently, to find the diameter, multiply the radius by 2.

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A circle that measures 10 feet across has a radius of 5 feet. The diameter is the distance from one side of the circle to the other, passing through the circle's center. The diameter equals two times the radius, so the r...

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An apothem of a triangle depends upon either the length of one of its side or the radius of a circle that fits inside it. There are two methods of determining an apothem through known measurements.

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To calculate the diameter of a circle, multiply the radius of the circle by 2. Diameter is the measure of the length of a straight line that passes through the center of a circle, touching the circumference or surface at...

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If the circumference or the area of a circle is known, pi can be used to find the diameter and the radius of that circle. Likewise, if the radius or diameter is known, pi can be used to find out the circumference or the ...

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The length of an arc of a circle is obtained by using the formula L=?r?/180, where L is the length of the minor arc of the circle, r is the radius of the circle and ? is the angle made by the arc at the center of the cir...

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