total area =
inner circle ...
middle ring ...
outer ring ...
An archery target consists of three concentric circles.
The outer rim of the target has a radius of 1.2m.
Find the radii of the two inner circles so that the three areas
(central circle and two rings) are equal)
Let = smallest radius.
Let = next larger radius.
We know that is the largest radius.
The area of the central circle is: . .
The area of the middle ring is: . .
The area of the outer ring is: . .
Since the areas are equal,  =  gives us:
. . .
And  =  gives us:
. . .
Solve the system: .
. . and we get: .