Learning goals: Teacher Facing Comprehend that two shapes are considered “identical copies” if they can be placed on top of each other and match up exactly. Recognize that four side lengths do not determine a unique quadrilateral, but that three side lengths can determine a unique triangle. Use manipulatives to create a polygon with given side lengths, and describe (orally) the resulting shape. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.7 Angles, Triangles, and Prisms, Grade 7.