If your are referring to a triangle, then the vertices (angles) are identified using capital letters. So, for example, you can have a triangle ABC.
The sides opposite to each angle are labelled in lower case.
a is opposite ∠A, b is opposite ∠B, and side c is opposite ∠C
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Sine = Opposite divided by Hypotenuse Opposite is the side of the triangle opposite the angle (in this case the 90o angle). Hypotenuse is the side opposite the right angle in a right angle triangle. Therefore, Sine 90 = 1 because the opposite side and the hypotenuse are the same side, they are both opposite the right angle.
shortest side
the opposite (i know kinda obvious)Improved Answer:-The hypotenuse
The angle with the smallest measure is opposite the shortest side. Similarly, the angle with the largest measure is opposite the longest side.
The side opposite the right angle is the hypotenuse.