Question

The area of a circle is 98.56 cm². Find its circumference.

Answer 1

Let the radius of the circle be r.

Now.

Area = 98.56

⇒ πr² = 98.56

`⇒ 22/7xx"r"^2 = 98.56`

⇒ r = 5.6

Now,

Circumference `=2pi"r"=2xx22/7xx5.6=35.2  "cm"` 

Hence, the circumference of the circle is 35.2 cm.