Right-Angled
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A right-angled triangle is any triangle having one right angle. The side opposite the right angle is called the hypotenuse. A right-angled riangle may be isosceles or scalene.
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Miscellaneous Right TrianglesSource
V. I. Hallock I.C.S. Refrence Library (Scranton: International Textbook Company, 1905) 20: page 13 in arithmetic section
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