consecutive\adjacent
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It is a parallelogramIf one of the angles is a right angle (then they all are) and the quadrilateral is a rectangle.If both pairs of sides are equal in length (but none of the angles is a right angle) the quadrilateral is a rhombus.If the sides are equal and one of the angles is a right angle, the quadrilateral is a square.
False. If both pairs of opposite angles of a quadrilateral are congruent then the quadrilateral is a parallelogram.
A and B, B and C, C and D, D and A, are all supplementary pairs. The figure has no complementary pairs of angles.
True
If a quadrilateral has two pairs of opposite congruent sides, then the quadrilateral is a parallelogram.