Mathematics - Geometry - Perimeter and Area - Area of parallelograms and trapezoids - Cut and Rearrange

Show a parallelogram. Animate: cut a triangle from one end, move it to the other end. It forms a RECTANGLE! The area didn't change. So parallelogram area = base × height (same as the rectangle it becomes). Show this transformation for 3 different parallelograms. The student clicks to trigger each cu