Posted by Christopher on Wednesday, January 5, 2011 at 8:26pm.
D = X deg.
E = 3X,
F = 3X - 9.
X + 3X + (3X - 9) = 180deg.
7X = 180 + 9,
7X = 189,
X = 189 / 7 = 27deg.
D = X = 27deg.
E = 3X = 3*27 = 81deg.
F = 3X - 9 = 3*27 - 9 = 72deg.
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