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What is the circumference of a circular table with a diameter of 15 inches?
Wiki User
∙ 12y ago
Circumference is found by the equation C = 2 * pi * r, where r is the radius and pi is the constant pi.
We are given the diameter. If you look at a circle, the diameter of it is the distance from one end of the circle to the other. We want the radius of the circle. The radius is the distance from any point along the circle to the center of the circle. If we let the diameter = d and the radius = r, we can write a formula for the diameter in terms of the radius.
Because the radius is half of the distance of the diameter,
d = 2*r
15 = 2 * r (divide both sides by 2)
r = 7.5
so C = 2*7.5*pi
C = 15pi
Note that we could have used C = pi*d, although this is not usually how circumference is expressed.
Wiki User
∙ 12y ago
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