The isosceles triangle can be split into two right-angled triangles. Pythagoras’ theorem can then be used on either of the two right-angled triangles. The 25 cm length becomes the hypotenuse so ...
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High school students make mathematical history with new proofs of ancient theoremFour of their proofs work for non-isosceles right triangles, while the fifth proof ... belief that trigonometric proofs of ...
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