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USA - Geometry Quadrilateral theorems

Proving a quadrilateral is a specific type

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Question 1
181461
Which condition is enough to prove that a quadrilateral is a parallelogram?
A.
Both pairs of opposite sides are congruent.
B.
Only one pair of opposite sides is congruent.
C.
The diagonals are perpendicular.
D.
The quadrilateral has exactly one right angle.
Both pairs of opposite sides are congruent.

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