Please refer to the attached problem.

I think I know how to start the problem, but not sure how to reach an answer that fits the answers provided by the exam.

Answer = Area of Circular Medallion - Area of Circular Colored Glass = Area of Metal Frame

pie*r^2 - pie *(r - s)^2

= pie * r^2 - pie * r^2 - 2s + s^2

Is that correct so far? And how do I reach a final answer?

Thank you!

YOu are on the right track. You just need to factorize a little more.

pi*r^2 - pi*(r - s)^2
= pi * r^2 - pi * (r^2 - 2rs + s^2)
= pi*r^2 - pi*r^2 + 2pi*r*s - pi*s^2
= 2pi*r*s - pi*s^2
= pi*s(2r - s)
= E

so close....clear explanation.

Thanks givemeanid.

Nice job once again, givemeanid. You've been a great help on the forums - keep up the good work!