Which if the following is an undefined term? a) angle b) line c) ray d) vertex

For this case we have to:

Angle: It is the space that is formed between two lines that start from the same point.

Line: It is the infinite succession of points. The lines extend in the same direction.

Vertice: The point that joins the segments of two or more one-dimensional elements is called.

The undefined word in this case is: Ray

Ray

step-by-step explanation: the answer for wha if rt is 10 centimeters long, and wha is st? it’s 6