prove that if two sides of a triangle are congruent then the opposite of them are congruent
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we will take ∆PRQ
Since S is the midpoint of PQ
PS=QS
Join R and S
By Reflexive Property ,
RS=RS
PR= RQ
Therefore, by SSS ,
ΔPRS≅ΔQRSΔPRS≅ΔQRS
Since corresponding parts of congruent triangles are congruent,
∠P≅∠Q∠P≅∠Q
The converse of the Isosceles Triangle Theorem is also true.
If two angles of a triangle are congruent, then the sides opposite those angles are congruent.
If ∠A≅∠B∠A≅∠B , then AC≅BC
AC≅BC
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