This is an 85 slide PPT that goes through an entire unit on quadrilaterals and polygons: It has 7 completely animated lessons including examples on the following topics...
Two-Dimensional Figures
Parallelograms
Tests of Parallelograms
Rectangles, Rhombus, and Square
Trapezoid and Kites
Area of Parallelograms and Triangles
Area of Trapezoids, Rhombi, and Kites