Why sin 90 is 1? When the reference angle becomes 90 and the adjacent side becomes 0, the triangle is not a triangle anymore. - Quora

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Why do we do trigonometry with only 90° angled triangles? Can't we

Sin 90 degree, Why sin 90 equals 1, Trigonometry

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Why is sin 90 taken to be 1? - Quora

Sin 90 Degrees I Formula and its Derivation I Sample Examples

Sine is the ratio of two sides of a triangle. How can it be

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