There are three undefined terms in geometry. These are point, line, and plane.
An angle can be perfectly defined by using only the intersection of two lines. Parallel lines, too, can be precisely defined using two lines with the same slope. The arc and the circle needs more definition than by using only the point, line, and plane therefore they are not part of the answer. While it can be tricky, we cannot define a line segment based on a line and some points too since a line is extending infinitely.
ANSWER: angle, parallel lines.
