Question

The perimeter of a semicircle is $15$ centimeters. What is the semicircle's diameter? (Use $\pi =3$)

• A. $2$ cm
• B. $4$ cm
• C. $6$ cm
• D. $8$ cm

Answer 1

Answer: (C)

$6$ cm

Perimeter $=15$ cm
Perimeter of the semicircle $=$ $\frac{\pi d}{2}+d$
$15=\frac{3d}{2}+d$
$15\times 2=3d+2d$
$30=5d$
$d=6$cm