A nonagon is a nine-sided polygon in geometry. The Latin prefix "nonus" means "ninth." Like many polygons, nonagons can be regular or irregular. Regular nonagons have nine equal sides and nine interior angles equal to 140 degrees each. On the other hand, irregular nonagons have nine sides and angles that do not have to match, so they can be drawn in any way.
To draw a regular nonagon, you need a ruler and a protractor. First, choose a length for the sides; for instance, 5 centimeters. This is the length for each of the nine sides of the nonagon. Next, use the ruler to mark two points at the length chosen. Connect the points using the ruler; this is the first side. At one of the points, use the protractor to measure 140 degrees clockwise and, using a pencil, draw a line extending from the measurement. Use the ruler to measure the pencil line and mark the dot at the length chosen for the side. Erase the excess pencil line past the dot. Repeat the process using the protractor to ensure the angles are all 140 degrees, drawing dots and connecting them until there are nine equal sides in length and nine equal 140-degree angles.