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" If the square described on one side of a triangle be equal to the sum of the squares described on the other two sides, the angle contained by these two sides is a right angle. "
A Text-book of Geometrical Deductions - Page 138
by James Andrew Blaikie, William Thomson - 1891
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A First Course of Geometry

130 pages
...If the square described on one side of a triangle be equivalent to the sum of the squares described on the other two sides, the angle contained by these two sides is a right angle. Let ABC be a triangle in which BC2 = AB2 + AC2; to prove that BAG is a right angle....
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School Certificate Mathematics

Mathematics - 1965 - 232 pages
...Theorems. (Converse of Pythagoras' Theorem.) If the square on one side of a triangle is equal to the sum of the squares on the other two sides, the angle contained by these sides is a right angle. 90 Given. In &ABC, Reqd. To prove LA =90°. Proof. Construct AJETZ with ZX...
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