the vertex
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A corner of 90 degrees is a right angle
right angle
Two angles are Adjacent if they have a common side and a common vertex (corner point) and don't overlap.
The hypotenuse is the longest side on a right triangle. It is the side that is opposite (directly across from and facing) the 90-degree angle. If your drawing shows a 90-degree angle by labeling it with a small corner (box), then the point of the corner always points toward the side that is the hypotenuse.
Angle.