Learning goals: Teacher Facing Compare and contrast (orally) different strategies for finding the area of a polygon. Describe (orally and in writing) the defining characteristics of polygons. Find the area of a polygon, by decomposing it into rectangles and triangles, and present the solution method (using words and other representations). Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 6.1 Area and Surface Area, Grade 6.