Make lesson planning easy with this no-prep Perimeter and Area of Rectangles, Parallelograms, Triangles, and Trapezoids Unit! Included are 11 ready-made lessons to teach the perimeter of polygons and the area of rectangles, parallelograms, triangles, and trapezoids. This unit is very easy to use and will save you a lot of time! Your students will learn how to find the perimeter of polygons and the area of rectangles, parallelograms, triangles, and trapezoids by using our editable PowerPoints wit