Question

solve the following question

Answer 1

Hi !!







Perimeter of semicircular protector = 108

πR + 2R = 108


R ( π + 2 ) = 108


R ( 22/7 + 2 ) = 108


R ( 22 + 14 ) /7 = 108



R ( 36) = 108 × 7


R = ( 108 × 7 ) /36


R = 3 × 7


R = 21 cm

Answer 2

Hence there is formula,

pi D/2 + D
We can also write D/2 = R and D = 2R

=> pi x R + 2R = 108 cm
Taking R as common,
=> R(pi + 2) = 108 cm
=> R (22/7 + 2) = 108 cm
=> R ( 22+14/7) = 108 cm
=> R x 36/7 = 108 cm
=> R = (108 x 7/36)
=> R = 756/36 cm
=> R = 21 cm

Be Brainly