Join the IDNLearn.com community and start getting the answers you need today. Get prompt and accurate answers to your questions from our community of experts who are always ready to help.

*urgent* Need Determine whether this quadrilateral must be a parallelogram

Urgent Need Determine Whether This Quadrilateral Must Be A Parallelogram class=

Sagot :

Isn't that a parallelogram?

It must be a parallelogram because both sets of opposite angles are congruent and the sum of all angles equal 360°, meaning that both sets of opposite sides are parallel.