Question

the radius of Sector is 21 cm
Central angle is 120°. Find the perimeter of the sector​

Answer 1

Answer:

44

explanation

circumference=2×(22/7)×r

here,r=21

so,circumference=44/7×21

=132

c of sector=(angle/360)×total c

=(120÷360)×132

=132÷3

=44

Answer 2

Perimeter = 2πr×∅/360

Where ∅ is the central angle.

Thus, perimeter = 2×3.14×21×120/360 = 43.96.