Bunuel wrote:
If the area of the trapezoid GECD above is 90, what is the area of ∆ EFG?
(A 60
(B) 64
(C) 66
(D) 68
(E) 72
[Reveal] Spoiler:
We see that the height of the trapezoid is 12, and base 1 = 2. If we let base 2 = n, we can determine n with the following formula:
area = (base 1 + base 2)/2 x height
90 = (2 + n)/2 x 12
180 = 24 + 12n
156 = 12n
13 = n
Thus, the base of triangle EFG is 13 - 2 =
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