Question

1. Prove that the bisector of the vertical angle of an isosceles triangle is perpendicular to
the base.
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Answer 1

Step-by-step explanation:

Let ΔABC be the isoceleus triangle with AB=AC and AD as vertical angle bisector

AB=AC∠B=∠C∠BAD=∠CAD

So by ASA  criteria  the triangles are congruent.

⟹BD=DC

So the bisector  of vertical angel bisects the base