Question

what is the relation of an isosceles triangle?

Answer 1

In an isosceles triangle that has exactly two equal sides, the equal sides are called legs and the third side is called the base. The angle included by the legs is called the vertex angle and the angles that have the base as one of their sides are called the base angles. The vertex opposite the base is called the apex.
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Answer 2

its opposite sides are equal and opposite angles also.By a theorem.i.e. draw an angle bisector from A then prove both the triangles congruent by SAS