Question

If then form
the opposite angles of a rhombus are congruent​

Answer 1

If the quadrilateral is a rhombus then the opposite angles are congruent
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Answer 2

Answer:

Opposite angels are congruent (D = B). Consecutive angles are supplementary (A + D = 180°). If one angle is right, then all angles are right. The diagonals of a parallelogram bisect each other.