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This problem can be used if you're looking for a really challenging problem.
I don't like just handing out bonus points, so this is a problem I made up - if students get this correct, they definitely put in a lot of thought and work, and they deserve some bonus points.
Students should already have a knowledge of solving equations with square roots, the Pythagorean Theorem, and how to find the area of circles, triangles, rectangles, and trapezoids. (I used 3.14 for pi in the answer key).