A right angled triangle has three sides.
The naming of these sides is dependant on which angle you are observing.
The first side is named the opposite and is the side which is not in contact with the angle that is being observed (each angle is in contact with ONLY two sides)
The second side is the hypotenuse which is the side opposite to the right angle. Also termed the diagonal, the hypotenuse is the longest side of the triangle.
The third side, the one you are interested in, is the adjacent side which is the angle which is in contact with the angle being observed which ISN'T the hypotenuse or the opposite. It can be determined by a process of elimination in that there are two sides in contact with the observed angle.
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In a right triangle, two of the angles are acute ones. Referring to one of the acute angles, the ratio of the side opposite it to the side adjacent to it is the tangent of the angle.
It is called the hypotenuse. The adjacent side is beneath it and the opposite side opposite it.
Given the reference perspective of a specific angle the sides are are the adjacent sides and the opposite side If we have a right triangle the longest side (opposite the right angle) is the hypotenuse.
If it isn't the hypotenuse, then it's the "Adjacent" side.
The hypotenuse is: 10