Question

Circumference of a semicircle is .

• A. $\pi r+d$
• B. $m\pi r+d$
• C. $3\pi r+d$

Answer 1

The correct option is A $\pi r+d$

Circumference of a circle =$2\times \pi \times r\text{circumference of a semicircle}=\frac{2\times \pi \times r}{2}=\pi \times r$
For a semicircle to be closed figure, we need to consider its diameter also.
Hence, Circumference of a semi circle = $\pi r+d$ units.