Question

Here is a semicircle of radius x.

Answer 1

Explanation:

Expression for Semicircle perimeter: xπ + 2x. (C)

Therefore x(π + 2) = 25.71 and x = 25.71 / (π + 2) = 5.

Answer 2

a) C

b)

3.142x + 2x = 25.71

5.142x = 25.71

x = 5