An angle does not have a mid point.
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It is the mid point of the angle
The point of an angle is its vertex
The angle of depression of a point is the angle between the line joining that point and the point of observation and the horizontal from the point of observation.
Normally it's its centre which is at the mid point of its diameter.
Every point on the bisector of an angle is equidistant from the sides of that angle. It is understood that the distance of a point from a line is the length of the perpendicular dropped from the point to the line.