91Ó°ÊÓ

Construct a line perpendicular to a given line through a given point outside the line.

Construct the perpendicular bisector of a given segment. Bisect a given angle.

To construct an angle whose measure is equal to the sum of the measures of two given angles.

Construct the mean proportional between two given segments.

Divide any segment into three congruent segments.

Construct the segment of length equal to \(\mathrm{a} \cdot \mathrm{b}\) where a and \(\mathrm{b}\) are the lengths of the segments below. (Unit length is shown below.)