I'll use a clock as an example.
Lets say you are standing on top of a clock which is painted on the floor, if you were to start by facing the 12:00 position and then turn towards the 3:00 position, you just turned 90 degrees.
If you start by facing 12:00 and then turn and face 6:00, you just turned 180 degrees.
If you were to stand and spin in a full circle, you turned 360 degrees.
A 90 degree intersection would be like making a basic right-hand turn.
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Perpendicular intersection is like a 90 degree angle so anything that crosses and forms a 90 degree angle
A Vertex is the point of intersection, and a Perpendicular Vertex is a vertex with all 90 degree angles, to be specific.
A right triangle has a 90 degree angle in it. This is not to be confused with a wrong triangle, which has two 90 degree angles.
A 90 degree rotation is a quarter of a turn.
90 degrees