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when does a parallelogram become rhombus?

A. it must have four congruent angle

B. it must have two pair of congruent angle

C. it must have four congruent sides

D. it must have a pair of congruent sides


Sagot :

Answer:

a.

Step-by-step explanation:

a parallelogram becomes a rhombus when its all sides become equal and when its all angles become 90°