Question

One property of parallelograms not shown in the interactive is that the opposite sides are parallel. Given a parallelogram, how would we prove (or know) the opposite sides are parallel?

Answer 1

The opposite sides can be proven parallel to each other if the lines would not intersect each other if the lines were much longer. It should also have the same straight horizontal measurement of distance in between the space. Measurement of parallel lines in a parallelogram can be determined using the slope formula.