trigonometry - How would a triangle for sin 90 degree look - Mathematics Stack Exchange

I am studying trigonometry in my school and learned that in a triangle the side opposite to angle theta should be taken as perpendicular side - hypotenuse remains the same and the third remaining s

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Can I get some help with math? Realized not only do I not know how to do the math here, I don't know the word for it, so I can't even search

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