Learning goals: Teacher Facing Describe, compare, and contrast (orally and in writing) triangles that share three common measures of angles or sides. Justify (orally and using other representations) whether triangles are identical copies or are “different” triangles. Recognize that examining which side lengths and angle measures are adjacent can help determine whether triangles are identical copies. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.7 Angles, Triangles, and Prisms, Grade 7.