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For example, you might name an angle as "ABC", where "B" is the vertex, and "A" and "C" are points lying on the sides of the angle. If there are additional points on the same sides, you can substitute those points instead.
To draw circles you need to use a compass
You might be thinking of the word origin.
a compass
The properties associated with the angles of a circle is the amount of rotation about the point of intersection of two lines in order to make one line into correspondence with the other. The arc of a circle consists of two points on the circle and all of the points on the circle lie between those two points.