¶ 1983 AHSME Problem 4
Problem:
The area of the figure where sides and are parallel, as are sides and , and sides and , each side has length , and is
Answer Choices:
A.
B.
C.
D.
E.
Solution:
Draw in lines and . There are now equilateral triangles with side length . (For instance, is equilateral because and .)
Thus the total area is .