what shape would you get if you put a triangle and a parallelogram together?

Question

triangle plus a parallelogram

Answer 1

You could have a trapezium (trapezoid). The triangle's base would be a continuation of a side of the parallelogram and another of its sides would be shared with the parallelogram. You could also have an irregular pentagon if only one side was shared and neither of the other two sides is a continuation of a parallelogram side.