Question

Work out your perimeter of a semicircle with raduis 3cm give your answer in terms of pie

Answer 1

18.84 cm

Explanation:

P = 2 × pi × r

= 2 × 3.14 × 3cm

= 6cm × 3.14

= 18.84 cm

Answer 2

9/2 π

Explanation:

`Perimeter = (\pi r^2)/(2) \\r = 3\:cm\\\\P = (\pi * 3^2)/(2)\\ \\P = (\pi * 9)/(2)\\ \\P = (9 \pi)/(2) \\\\P = (9)/(2) \pi`