Posted by shraddha on Friday, March 9, 2012 at 7:43am.
Your triangle is overdetermined. Three sides, which are given, fully define the triangle, which in your case is isosceles. The apex angle imust be 2*sin^-1 (2.5/4) = 77.36 degrees, and the other two angles are
(1/2)(180-77.36) = 51.32 degrees
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