Question

1. all of the following constructions start with a line segment except what? constructing a line perpendicular to a point on a line constructing a 45° angle constructing equilateral triangles constructing a 30° angle

Explanation:

Constructing a line perpendicular to a point on a line starts with a line and a point on that line, not just a line - segment. Constructing a 45° angle, equilateral triangles, and a 30° angle often start with a line - segment as a base for further geometric operations.

Answer:

constructing a line perpendicular to a point on a line