Looking for a time-saving way to teach geometry? This free editable lesson on problems and proofs that use the 5 properties of parallelograms is a full preview of Unit 6 of my Geometry Curriculum and is ready for you to print and teach today. Students will learn how to solve numerical problems and proofs related to the properties of a parallelogram, including problems that incorporate old material such as linear pairs, triangle sum theorem, alternate interior angles theorem, etc. No prep requi