The sides of right-angled triangles are labelled opposite, hypotenuse and adjacent. Trigonometry explores the relationship between sides and angles in right-angled triangles. The hypotenuse is the ...

It's long been claimed impossible to use trigonometry to prove what is ... the relationship between the three sides of a ...

the size of angles) and mathematical magic can deliver unknown quantities. Trigonometry—from the Greek words for “triangle” and “to measure”—is an indispensable mathematical tool.

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