Question

find circumference of the circle whose area is 1386 cm²​

Answer 1

Answer:

answer is 132 cm

Explanation:

Area of a circle of radius r =πr2=1386cm2

722×r2=1386cm2

r2=441cm2

r=21cm

Circumference of a circle of radius r =2πr

Circumference of circle of radius 21cm=2×722×21=132cm

Answer 2

Area of circle = 1386 cm2

πr2 = 1386

(22/7)r2 = 1386

r2 = 1386 × (7/22)

r2 = 441

r = √441

r = 21 cm

Circumference = 2πr

= 2 × 22/7 × 21

= 132 m