what will be angle of triangle whose side are 1400, 1400 and 1250?

find also sin, cos and tan.
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2 Answers

This is an isosceles triangle. The perpendicular bisector of the apex angle A also bisects the base (1250). 1400 is the length of the hypotenuses of the two back-to-back right triangles forming the isosceles triangle.

sin(A/2)=(1250/2)/1400=625/1400=25/56.

A/2=26.51°, A=53.03° approx. The other two angles are 63.49° approx.

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