Question

Tell whether you can prove that each quadrilateral is a parallelogram. Explain.

Answer 1

WE know that in any quadrilateral the interior sum of its angles is 360. The missing angle in this case is:

`360-121-59-59=121`

Now, we also know that if the oposite angles in a quadrilateral are equal then the quadrilateral is a parallelogram.

Therefore the figure shown is a parallelogram.