Question

Find the radius of a circle whose area is a)154sqcm b)616sqcm.​

Answer 1

Correct option is A)

Let r be radius of given circle.

Given, area=616 cm

2

.

We know, area of a circle =πr

2

.

⇒πr

2

=616

⇒

7

22

×r

2

=616

⇒r

2

=616×

22

7

⇒r

2

=196

⇒r=14 cm.

Answer 2

Answer:

a) radius = 7cm

b) radius = 14cm

Step-by-step explanation:

a) Given, area of the circle = 154 cm²

=> πr² = 154

=> r² = 154 × 7/22

= 49

=> r = 7cm

b) Given, area of the circle = 616 cm²

=> πr² = 616

=> r² = 616 × 7/22

= 28 × 7

= 196

=> r = 14cm