In the triangle ABC, a, B and C are the diagonals of side a, B and C respectively, and A-B = 4, a + C = 2B. The maximum angle is 120 degrees?

Let s be the area of a triangle, where s * s = (b * c * Sina / 2) * (b * c * Sina / 2) = (A-4) (A-8) (A-8) * sin120 * sin120 / 4 = (A-4) (A-4) (A-8) (A-8) * 3 / 16S * s = P (P-A)

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