Question

What is the parimeter of sector with radius 21 cm and sector angle 60°

Answer 1

=

Radius = 10.5 cm and Sector angle = 60°

Perimeter of a sector of a circle = [(theta/360°)*2πr] + (2r)

⇒[(60/360)*2*22/7*10.5] + (2*10.5)

⇒ 1*462/6*7 + 21

⇒ 462/42 + 21

⇒ 11 + 21

⇒ 32 cm

So, the perimeter of sector is 32 cm

Answer 2

R = 21 cm

angle = 60

perimeter of sector

= length of arc + 2R

=2πr×60/360 +42

=2 × 22/7×21×1/6 +42

= 22+42

= 64 cm