The perpendicular bisector of a line segment is the line that is perpendicular to the line segment.

$30°, 60°, 120°, 90°, 45°$ etc. are some special angles which can be constructed without use of protractor.

A line which is perpendicular to a given line segment and divides it into two equal halves is called a _____ of the line.

The measure of an angle depends upon _____.

Fill in the blank:

_____ line(s) can be drawn passing through two given points.