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how do you prove that two opposite angles are congruent on a parallel triangle

Sagot :

To prove that two opposite angles are congruent on a parallel triangle, we will use a parallelogram ABCD as shown;

From the parallelogram, AB is parallel to CD and AC is parallel to BD

AB = CD

AC = BD

BC is a diagonal

Since triangle ABC is congruent to triangle BCD, hence opposite angle

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