Question

if the permeter of a semicircular protactor is 66 cm find the radius of the profacter

Answer 1

Step-by-step explanation:

perimeter of circle =2pi×r

perimeter of protractor= half circle perimeter + diameter

66= 2Pi ×r/2 + 2r =pi×r +2r = r(pi +2)

r=66/5.14 = 12.84