Question

What is the best approximation for the perimeter of a semicircle with a diameter of 35 inches?

Use 3.14 to approximate pi.

A. 54.95 in.

B. 89.95 in.

C. 109.90 in.

D. 144.90 in.

Answer 1

Answer: it is B 89.95 in

i hope this helps you

Answer 2

perimeter of a semicircle is calculated as follows;

diameter = 35 inches

circumference of circle - 2πr
r - radius -
r = diameter / 2 = 35 /2 = 17.5 inches

circumference = 2 x 3.14 x 17.5 = 109.9 inches

circumference is perimeter of whole circle. we need to find the circumference for half the circle.
therefore perimeter for the curved line = 109.9 / 2 = 54.95 inches

perimeter of half circle = diameter + curved line perimeter = 35 + 54.95 = 89.95 inches

answer is B. 89.95 in.