How do I prove that if a quadrilateral has consecutive angles that are supplementary, then it is a parallelogram?
1 Answer
Nov 15, 2015
Not necessary
Explanation:
Consider a trapezoid with angles 35-135-90-90.
It has 2 instances of consecutive (adjacent?) angles that are supplementary (35-135 and 90-90) but it is not a parallelogram
