Opposite sides of a parallelogram have the same length and are, obviously parallel. Th means that for a parallelogram ABCD as shown below,
and![]()

If A, B and C are the points (2,3), (4, 7) and (9,10) respectively, then
and

so
Hence
Opposite sides of a parallelogram have the same length and are, obviously parallel. Th means that for a parallelogram ABCD as shown below,
and![]()

If A, B and C are the points (2,3), (4, 7) and (9,10) respectively, then
and

so
Hence