Prove that the sides opposite the congruent base angles of a triangle are congruent. Be sure to create and name the appropriate geometric figures

Question

anonymous · Answer

@Michele_Laino @Hero plz help me

michele_laino · Answer

we have to consider the isosceles triangle, since the angles of the base of an isosceles triangle, are congruent each other

michele_laino · Answer

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michele_laino · Answer

please wait, sorry we have to restart with the solution.
Let's consider a triangle whose angles at its base are congruent each other

michele_laino · Answer

here is such triangle:
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michele_laino · Answer

Now we consider the heoght CH, as below:
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