Question

if the perimeter of semi circular protractor is 36cm find its diameter

Answer 1

perimeter of semicircle= πr+2r
perimeter is 36cm
36=22/7r+2r
36=22r+14r/7
36=36r/7
r=36×7/36
r=7
Diameter=2×7
=14

Answer 2

Answer:

perimeter of the circle is πr +2r

perimeter is 36

therefore 36=36/7(r)

r=36(7/36)

r=7

d=2r

d=14