What Sin, Cos, and Tan are, your choice.
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They are ratios of the side lengths in a right angled triangle. We have to focus on one of the two non-right angles in the triangle, as these values are a property of the angle itself (think similar triangles: if the angles are all the same in two triangles then their side lengths must be proportional to one another). Sine is the ratio of the side opposite the angle to the hypotenuse (opposite the right angle). Cosine is the ratio of the side adjacent to the angle to the hypotenuse and tangent is the ratio of the opposite side to the adjacent.
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