Question

what is the circumference of semicircle .

Answer 1

Hey Guys,

$cirumference \: of \: circle = 2\pi \: r \\ circumference \: of \: semicircle \: = \\ = \binom{2\pi \: r}{2} = \pi \: r \:$
Thanks.

Answer 2

circumference of semicircle is


$\frac{1}{2} \pi \times d + d$