Review question

Ref: R7032

## Suggestion

The sum of the circumferences of two circles is $\quantity{60\pi}{cm.}$ and the sum of their areas is $\quantity{458\pi}{sq.cm.}$ Calculate the radii of the circles.

The radius of the red circle is $r$ and the circumferences of the two circles add to $60\pi$.

The rectangles have the same areas as the circles.

How many solutions are there?

What radius gives the minimum or maximum area?