We can use a straightedge and compass to construct geometric figures, such as angles, triangles, regular n-gon, and others. In this case, measuring instruments such as a ruler and a protractor are not permitted.
A ruler can be used if and only if its markings are not used. Below, find a variety of important constructions in geometry.
Using a straightedge and compass to construct angles, triangles, quadrilaterals, perpendicular, and others.
Bisecting and copying angles
Bisecting an angle Learn how to bisect a given angle. Nice and fully illustrated demonstration.
Copying an angle Learn how to copy any angle. In other words, you will construct an angle congruent to a given angle. Learn to do this with ease using step by step guidelines.
Constructing perpendiculars and midpoint of a segment