Interactive resource
Parallelogram properties
Geometry. Drag vertices: opposite sides parallel and equal, opposite angles equal, diagonals bisect. Free interactive GeoGebra resource — adjust parameters…
Overview
Drag vertices: opposite sides parallel and equal, opposite angles equal, diagonals bisect.
Explanation
Definition: a quadrilateral with both pairs of opposite sides parallel.
Properties: opposite sides parallel and equal; opposite angles equal; consecutive angles supplementary; diagonals bisect each other.
Useful tests include one pair parallel and equal, or diagonals that bisect.
How to use
Drag A, B, D (C stays a parallelogram) and watch sides, angles, diagonals.