The distance across the circular mouth of a volcano running

The distance across the circular mouth of a volcano running through its center is 75 yards. What is the distance around its mouth?

A. 145.5 yd

B. 215.5 yd

C. 235.5 yd

D. 315.5 yd

Solution

C. To find the circumference of a circle, use the formula C = 2t. In this problem, you are given the diameter. You need to use the radius, which is d, or 37.5 yards. Substitute the information into the formula.

Note that you can skip a step if you remember the formula C = d. Substitute the information you have.

C = (75) = 235.5 yd