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Mathematics 12 Online
OpenStudy (anonymous):

ΔABC is a right triangle. Prove: a2 + b2 = c2 Right triangle BCA with sides of length a, b, and c. Perpendicular CD forms right triangles BDC and CDA. CD measures h units, BD measures y units, DA measures x units. The two-column proof with missing justifications proves the Pythagorean Theorem using similar triangles:

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