Question

The radii of two concentric circles are 123cm and 73cm, respectively.By how much does the area of the outer circle exceed the area of the inner circle?

Answer 1

Radius of outer circle is 123 cm(R)
Radius of inner circle is 73cm(r)
Area exceeded by outer circle
π(R²-r²)
22/7(123²-73²)
22/7(15129-5329)
22/7(9800)
30800cm²
The outer circle exceed the inner circle by 30800cm²

Answer 2

Answer:

let us considered A. O respectively

then

OA =73m

OB=123m

Now,

area of inner circle

=pi r2

=22by7 x73x73

= cm2

again

area of outer circle =pi r2

=22by7x123x124

= cm2