false
No. A quadrilateral is a parallelogram when consecutiveangles are supplementary.
True
false
false
true
its true this is a statement..... Is there a question attached
If a quadrilateral has two pairs of opposite congruent sides, then the quadrilateral is a parallelogram.
False. If both pairs of opposite angles of a quadrilateral are congruent then the quadrilateral is a parallelogram.
A quadrilateral is a polygon with four sides. A parallelogram is a quadrilateral in which the opposite sides are parallel.
No
Theorem A: A quadrilateral is a parallelogram if its opposite sides are congruent. Theorem B: A quadrilateral is a parallelogram if a pair of opposite sides is parallel and congruent. Theorem C: A quadrilateral is a parallelogram if its diagonals bisect each other. Theorem D: A quadrilateral is a parallelogram if both pairs of opposite angles are congruent.
A quadrilateral is a parallelogram if it has two pairs of (opposite) sides that are parallel.