Question

Which counterexample shows that the conjecture "Every four-sided figure is a

parallelogram" is false?

Answer 1

Yes is false because Which counterexample shows that the conjecture "Every four-sided figure is a
parallelogram" is false?

Answer 2

A trapezoid is one counter-example to show that some four-sided figures are not parallelograms. A trapezoid has only one set of parallel sides, while the other two opposite sides aren't parallel. All trapezoids have four sides.