Question

If the radius of a circle is 7cm and its area is 154 sq.cm find the ratio of a) its radius to area b)its area to radius​

Answer 1

Correct option is

B

44cm

Let the radius of circle be r cm.

Now the area of circle⇒πr

2

=154cm

2

⇒

7

22

×r

2

=154cm

2

⇒r

2

=

22

154×7

⇒r

2

=49

⇒r=7cm

Perimeter of the circle=Circumference

=2πr

=2×

7

22

×7

=44cm

Answer 2

Step-by-step explanation:

1) Radius : Area = 7 : 154 = 1 : 22

2) Area : Radius = 154 : 7 = 22 : 1