Question

what is the perimeter of the sector with radius 21cm and sector 60°?

Answer 1

perimeter of sector =2r+length of arc

here r=21cm

Φ=60°


llength of Arc length of Arc =Φ/360. x 2πr
l=60/360. x 2 x 22/7 x21
l=1/6x. 2 x22 x3
l=22cm


so perimeter of sector =2x21+22
=42+22
=64cm