Bunuel wrote:
In the rectangle above, if the unshaded region is equilateral and equiangular, what fractional part of the rectangular region is shaded?
(A) 1/6
(B) 2/9
(C) 1/4
(D) 1/3
(E) 4/9
[Reveal] Spoiler:
Since the unshaded region is a hexagon and it is equilateral and equiangular, it must be a regular hexagon. We know that a regular hexagon is composed of six equilateral triangles. Note that the diagonal drawn
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