16.3 Point Symmetry and Tests for the Parallelogram
Point 4 of 5
16.3.4 Testing for a Parallelogram from the Sides
Core idea
Both pairs of opposite sides parallel, or both pairs equal, or one pair both parallel and equal; meet any one and you have a parallelogram
Module goal. Introduce point symmetry as a fresh way of seeing symmetry, explain why a parallelogram has it, and systematically build up the various ways to test for one
eastmath.com · 16.3 Point Symmetry and Tests for the Parallelogram · 16.3.4 Testing for a Parallelogram from the Sides