pitagoras 1 en:https://es.khanacademy.org/math/geometry/hs-geo-trig/modal/v/pythagorean-theorem-proof-using-similarity
Pitagoras 2 en:https://es.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-pythagorean-proofs/v/garfield-s-proof-of-the-pythagorean-theorem
pitagoras 3 en:https://es.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-pythagorean-proofs/v/bhaskara-s-proof-of-pythagorean-theorem-avi
Pitagoras 4 en:https://es.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-pythagorean-proofs/v/another-pythagorean-theorem-proof
