**Tags: CCSS, common core, Pythagorean Theorem, right triangle, proof, middle grades mathematics, area, ratio**

Tags: Pythagorean-Theorem, right-triangle, geometric-proof, middle-school

Tags: Pythagorean-Theorem, algebraic-proof, area, middle-school

Tags: Pythagorean-Theorem, shear-transformation, common-core, middle-school, geometry, proof

Tags: Pythagorean-Theorem, algebraic-proof, right-triangle, middle-school, similarity, ratio