Question

Find the circumference of a circle whose are is 1386cm2​

Answer 1

Answer: area o the circle = πr²

1386 = 22/7×r²

1386÷22/7÷ = r²

1386×7/22 = r²

√441 = r

21 = r

so, we got the radius 21.

circumference of circle = 2πr

⇒  2×22/7 ×21

⇒2×22×3

⇒44 ×3

⇒132 cm.

Step-by-step explanation:

Answer 2

Answer:

Circumference of a circle=132cm

Step-by-step explanation:

Area of circle=1386cm²

πr²=1386

22/7×r²=1386

r²=1386×7/22

r²=63×7

r²=441

r=√441

r=21cm

Therefore, circumference of a circle

=2πr

=2×22/7×21

=2×22×3

=132cm