Answer:
--- small circle
--- big circle
Explanation:
Given
-- sum of areas
Required
The radius of the larger circle
Area is calculated as;
For the smaller circle, we have:
For the big, we have
The sum of both is:
Substitute:
Substitute
Factorize
Divide both sides by
Divide both sides by 5
Take square roots of both sides
The radius of the larger circle is: