Question

The area of circle b is 100 times greater than the area of circle

a. the radius of circle a is 3.2. what is the radius of circle b?
a.6.4
b.10
c.32
d.100

Answer 1

Let x be the radius of circle b & r=radius of the other circle

area of b is 100 times area of te other

Then
π.x²=100(π.r²)
After simplification X=10 times the smaller radius