- How to provea quadrilateralis a parallelogramgivencongruentoppositesides.
- How to provea quadrilateralis a parallelogramgivencongruentoppositeangles.
- How to provea quadrilateralis a parallelogramgiventhat the diagonalsbisecteachother.
- How to provea quadrilateralis a parallelogramif one pair of sidesis both congruentand parallel.
It is helpfulto be able to provethat certainquadrilateralsare parallelograms.You will be able to use this
informationin manydifferentways.
LessonExercises
Use the followingdiagramfor exercises1-3.
- Find eachangle:
a.b.c.d.- If and , find eachlength:
a.b.- If and , find eachlength:
a.b.Use the followingfigurefor exercises4-7.