Question

find the length of arc whose radius is 20 cm and perimeter is 110 cm​

Answer 1

Radius = 6 cm

Arc length = 20 cm

Find the circumference:

Circumference = 2πr

Circumference = 2π(6) = 12π cm

Find the area:

Area = πr²

Area = π(6)² = 36π  cm²

Find the area of the sector:

Arc Length = 20 cm

Area of the sector = ( arc length / Circumference ) x Area

Area of the sector = 20/12π x 36π = 60 cm²