How to construct a regular polygon through a circle using a compass and straightedge

Draw a straight line using the protractor. This will be the center line of your circle (dividing it into hemispheres).

Align the protractor with both 0° and 180°on the center line, then mark the center point.

Trace the semicircle along the protractor from 0 ° to 180°.

Put the protractor on the other side of the center line, again with the both the 0°and 180° protractor …