It's all about proving.

This is the question:

Quote:

Prove: Theorem 9-11. If both pairs of opposite sides of a quadrilateral are congruent then the quadrilateral is a parallelogram.

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- Jan 19th 2011, 02:23 AMiankasaiProve: Theorem 9-11 (HELP)
It's all about proving.

This is the question:

Quote:

Prove: Theorem 9-11. If both pairs of opposite sides of a quadrilateral are congruent then the quadrilateral is a parallelogram.

- Jan 19th 2011, 03:06 AMabhishekkgp
draw the diagonal of the quad.

the two triangles appearing will be found to be congruent and the rest follows easily.