Question

Sushant divide a circular disc of radius 7 cm in two equal parts .what is the perimeter of each semicircular shape of the disc ? (Use π 22\7)

Answer 1

given:-radius(r)=7cm

to find:-perimeter of each semicircle

sol:-if we find circumference and diameter of the circle ..then we can easily find the perimeter of semicircular disc

circumference of a circle=2$\pi$r

circumference of semi-circle=1/2×2$\pi$×r=$\pi$*r

                                                =22/7×7=22cm

diameter of the circle=2r=2×7=14cm

∴perimeter of the semicircular dics=22cm+14cm=36cm

thus,perimeter of ecah disc =36cm