Learning goals: Teacher Facing Describe (orally) situations that use right triangles, and explain how the Pythagorean Theorem could help solve problems in those situations. Use the Pythagorean Theorem to solve problems within a context, and explain (orally) how to organize the reasoning. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 8.8 Pythagorean Theorem and Irrational Numbers, Grade 8.