The circumference of a circle is equal to 72 pi. Find the radius of this circle. Choose the correct answer.
A) 32 B) 33 C) 36 D) 37 E) 39
The circumference of a circle is given by   C = 2 pi r, where r is the radius of the circle.   Substitute 36 by 72 pi to obtain the equation   72 pi = 2 pi r   Simplify and solve for r to obtain   r = 36   correct answer 36
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The circumference of a circle is equal to 72 pi. Find the radius of this circle.