Question

Evaluate the area of the semicircle if its circumference is $15.15cm$? (Use $\pi =3$)

• A. $7.475$ $c{m}^2$
• B. $6.575$ $c{m}^2$
• C. $4.575$ $c{m}^2$
• D. $7.575$ $c{m}^2$

Answer 1

The correct option is D $7.575$ $c{m}^2$

Circumference of a semicircle $=\pi r$
$15.15=\pi r$
$r=5.05$
Area of the semicircle $=\frac{1}{2}\pi r$
$=\frac{1}{2}\pi \times 5.05$
$=7.575$ $c{m}^2$