Question

Really need help Pls

Answer 1

20.57 cm

Explanation:

Circumference of half circle = diameter + half of circumference

`= 8 +(2\pi r)/(2)\\\\\\= 8 + \pi r\\\\= 8 + 3.142 * 4\\\\= 8 + 12.568\\\\= 20.568\\\\= 20.57 \ cm`