If 8 parallel lines in a plane are intersected by a family of 10 parallel lines. Find the number of parallelograms formed?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

A parallelogram is formed by choosing two straight lines 2 lines from the set of 8 lines and 2 lines from the set of 10 parallel lines.

Two parallel lines can be chosen in  ways from the set of 8 parallel lines and 2 parallel lines from the set of 10 parallel lines can be chosen in  ways.
 Hence, the number of parallelogram formed =

Answered by  | 4th Jun, 2014, 03:23: PM