Unit+3+-+Lesson+3+-+Finding+the+Perimeter+of+Non-Rectangular+Parallelograms+Using+the+Pythagorean+Theorem

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The ExploreLearning: Geoboard - Pythagorean Theorem Gizmo is a great interactive GeoBoard for drawing and demonstrating different types of polygons (in this case parallelograms). With the click of a button, you can display the length of all of the sides, the area, and any right angles.======