College Math CLEP Prep Practice Exam

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How do you calculate the circumference of a circle?

pi*d
2pi*d
pi*r2
2 pi*r

The correct answer is: 2 pi*r

To calculate the circumference of a circle, you can use the formula C = 2πr, where r is the radius of the circle. This is the same as 2 times pi times the radius, which is why option D is the correct choice. Option A, pi*d, only gives the diameter of the circle and not the circumference. Option B, 2pi*d, gives twice the value of the circumference. Option C, pi*r2, is the formula for the area of a circle, not the circumference. Therefore, option D is the only correct option for calculating the circumference of a circle.