Question

If a sector of a circle has its radius equal to 21cms and its area is 115.5 sq cms.find the length​

Answer 1

Answer:

r = 21 cm

Θ = 120°

The length of arc = 2πr x θ/360

= 2 x 22/7 x 21 x 120/360

= 44 cm

Area of Sector = πr² x θ/360

= 22 x 21 = 462cm²