If the hypotenuse of a right triangle is set to a unit length (length 1), then sine(alpha) simply equals the length of the opposite side, cosine(alpha) equals the length of the adjacent side, and all other trigonometric ratios can be calculated using only sine and cosine.
factualpending
Evidence Quote
“For instance, with a length of one, the sign of alpha simply corresponds to the length of the opposite side and the cosine to the length of the adjacent side. And even better we see that we can calculate the other ratios using just the sign and cosine.”
Created: 8/12/2026, 6:18:22 PM
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