Which undefined geometric term is described as a two-dimensional set of points that has no beginning or end?
a) distance
b) line
c) plane
d) point

We will consider all of the options in detail first. Distance is the separation between two points on a plane, and is calculated by squaring the difference in the y and x values, adding them and then taking their square root. A line is a one-dimensional set of points that extends infinitely far in only one dimension. A plane is a flat, two-dimensional surface that extends infinitely far in two dimension. A point is usually an element within the plane being considered. This exists in 0-dimensions. Therefore, the answer is C. plane.