Pythagorean Theorem Proofs Geometry Right Triangles and Trig Pythagorean Theorem Proofs Questions What is one method for proving the Pythagorean Theorem? How can the Pythagorean Theorem be proved using a mean proportional in a 2-column format? What was the original proof that Pythagoras himself used to prove his theorem? If #hatQ# is a Right-angle in #DeltaPQR and PR-PQ=9 , PR-QR=18# then what is the perimeter of the triangle? Right Triangles and Trig View all chapters Pythagorean Theorem Pythagorean Theorem Proofs Special Right Triangles Sine, Cosine and Tangent Functions Trig Ratios and Similarity Prev Next