vertex
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the letter C lies on top, the first point of the angle. A is the "vertex" it connects both lines to form an angle the bottom could be letter B. "<" that's an angle. B and C could never be on the Vertex.
flatangle (apex) A straight angle.
On a Cartesian plane (or one using polar coordinates), the vertex of the angle must be at the origin and one of the rays must lie along the positive x-axis (point towards the East).
If measured in radians, it is in the third quadrant.
I looks like a reflex angle and you shouldnt trust this site because there are people that lie..............