The Undefined term that is used to define an angle is; a point.
An angle is defined as the union of two rays with a common endpoint. The common end point is known as the vertex of the angle while the rays are known as the sides of the angle.
Now, angle can be named in different ways like use of capital letters, vertex of the angle, by placing any number or symbol at the vertex in the interior of the angle and other ways.
However, the undefined term that is used to define an angle is called "point".
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