Question

select the letter of the best answer choice. Use 3.14 or 22/7 for π
what is the circumference of a circle with a diameter of 21 ft? round your answer to the nearest foot.
A) 132 ft
B) 66 ft
C) 44 ft
D) 33 ft

Answer 1

3.14 x 21 = 65.94 (which rounds up to 66)

Your answer is B, 66. 

Answer 2

Because C= d x pi, plug it in, C = 21ft x 3.14, C = 65.94 ft, which is rounded to 66ft, your answer is B.