Learning goals: Teacher Facing Compare and contrast (orally) different strategies for calculating the area of a polygon. Find the area of a polygon by decomposing, rearranging, subtracting or enclosing shapes, and explain (orally and in writing) the solution method. Include appropriate units (in spoken and written language) when stating the area of a polygon. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 6.1 Area and Surface Area, Grade 6.