Answer:
Step-by-step explanation:
area of circle=π*r^2
=3.14*2.5^2
=3.14*6.25
=19.625
=19.63
Given
and
(say).
Then,

From the above 3 equations,

From the equations, we get

Since
, the negative value is rejected.

It's similar to example above,I hope you get it.