Parallelograms By A*Maths on September 6, 2014 in C1 It's only fair to share...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, thenand so Hence