Question

The area of a circle is 38.5 square metre find its circumference in centimetre​

Answer 1

Answer:

Area of a circle =πr

2

∴38.5=πr

2

∴

7

22

×r

2

=38.5

⇒r

2

=38.5×

22

7

⇒r

2

=12.25⇒r=

12.25

∴ r=3.5

Now, Circumference of circle =2πr

∴ Circumference of circle =2×

7

22

×

10

35

∴ Circumference of circle =22m = 2200cm