Question

What is the approximate distance around the half circle with a diameter of 64 meters?   A. 100.48 m   B. 200.96 m   C. 401.92 m   D. 1607.68 m

Answer 1

Well, first you should know the formula for finding the full distance around a circle. The distance is also known as the circumference C:

C = 2πr 

where r is the radius which is half of the diameter. since we know the diameter, then we have enough information to solve for this:

C = 2π(64/2) m

C = 2π(32) m

C = 64π m

C ≈ 200.96 m

Now you might choose this as the answer, but the problem asks for half of the distance around the circle which is half of the circumference:

1/2C = 200.96/2

1/2C = 100.48

Thus the answer is A. 100.48.

Answer 2

Your answer is A. 100.48 m I believe.