A number between 0 and 1. The value depends on the angle between
the two sides, and it's called the cosine of that angle.
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In a specific angle for a right triangle the cosine ratio is the ratio between the lengths of the adjacent side (side touching the angle) and the hypotenuse (longest side).
False because sine ratio = opposite/hypotenuse
Nearly! The cosine is the adjacent side (ie not the opposite side) divided by the hypotenuse.
The opposite side of an adjacent is the hypotenuse. Sin(q) = Opposite / Hypotenuse Cos(q) = Adjacent / Hypotenuse Tan(q) = Opposite / Adjacent Reference: http://easycalculation.com/trigonometry/triangle-angles.php
cosine