Question

The radius of two circles are cm and 12cm. Find the radius of a circle whose area is equal
to the sum of the areas of these two circles.
(See Lesson-20)

Answer 1

Step-by-step explanation:

1 st circle radius is missing

Answer 2

Answer:

Area of first circle =81π

Area of 2nd circle =144π

Area of 3rd circle =255π

Let radius of 3rd circle =R

∴πR

2

=225π

R

2

=225

R=15

∴ Circumference =2×π×15=30πcm.