Question

What is the best approximation for the perimeter of a semicircle with a diameter of 12 cm?

Use 3.14 to approximate pi.

18.84 cm

30.84 cm

61.68 cm

75.36 cm

Answer 1

Option 2

Explanation:

if you multiply by 1/2 by pi times diamter give you 18.84 plus 12 would give you 30.84

Answer 2

= (2 x pi x r) / 2
= (2 x 3.14 x 6)/2
= 37.68 / 2
= 18.84

answer is 18.84 cm (first one)