You have not described this problem in sufficient detail. If you are talking about triangles, then in some situations trigonometric functions are applicable. Or, you could just measure the side with your ruler, although if that is what you are going to do, then the fact that it is oppoiste an angle is irrelevant.
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The length of the side opposite the 60° angle is about 14.72(sin 60°) = 0.866The length of the side opposite the 30° angle is 8.5(sin 30°) = 0.5
The ratio of the length of the side opposite a given angle to the hypotenuse is the sine of that angle.The ratio of the length of the side adjacent to a given angle to the hypotenuse is the cosine of that angle.The ratio of the length of the side opposite a given angle to the side adjacent to that angle is the tangent of that angle.
3root3
Yes because tangent = opposite/adjacent
If you have an angle then the length of the side OPPOSITE that angle divided by the length of the HYPOTENUSE. (O/H) (HYPOTENUSE is the side opposite the 90 degree angle) or (y/x) and a lot of other cool ways.