Posted by miguel on Tuesday, November 16, 2010 at 6:38pm.
they add up to 360 degrees
(10x-25) + 10 x + 3 x^2 +2 x^2 = 360
5 x^2 + 20 x -25 = 360
5 x^2 + 20 x - 385 = 0
x^2 + 4 x - 77 = 0
(x-7)(x+11) = 0
x = 7
forget negative 11, no such angle needed
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