Problem:
Rectangle  and right triangle  have the same area. They are joined to form a trapezoid, as shown. What is 

Answer Choices:
A.  
B.  
C.  
D.  
E.  
Solution:
The area of rectangle is . The area of triangle is also , which is half of the product , so that product is . Because must equal , and by the Pythagorean Theorem, .
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions