Question

The perimeter of a semicircular protractor is 30 2.4 cm calculate the radius of the protector

Answer 1

perimeter of semicircle = 2πr × 180°/360°

2 × 3.14 × r × 1/2 = 302.4

3.14 × r = 302.4

r = 302.4/3.14

r = 96.30 cm