Question

The sum of the length of a semi- circular bow and it string in 144 cm find the length of string.

Answer 1

The shape is in semi-circle

Perimeter of semi-circle = Perimeter of circle ÷ 2

                                         = πr

Given, πr = 144

             r = 144 ÷ π

                = 144 ÷ 22/7

          ⇒ r = 45.81

Length of the string = 2 × r

                                  = 91.62cm