Which undefined geometric term can be described as a one-dimensional set of points that has no beginning or end? Which statements are true based on the diagram?

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .

Its d so thats how it would would back from 1.0 form three four two