2.- POLYGONS

TO START WITH...

Inscribed regular polygons:

Now that you know the names, we're going to learn how to construct basic polygons. In this video we're going to review Regular polygons inscribed in a given circle.

REGULAR POLYGONS WITH A GIVEN SIDE:

Now we're going to learn how to construct basic polygons with a given side.

Dividing a segment into several equal parts

We use Thales theorem to divide a given line segment into a number of equal parts with compass and straightedge or ruler. By using a compass and straightedge construction, we do this without measuring the line.

Draw the given segment AB. This is the segment that we want to divide.
From point A draw an oblique ray (r).
Choose a measure with your compass. From point A draw arcs on the oblique ray as many arcs as parts you need.
Join the last point of the oblique ray C with point B.
Draw parallels using your set square to the segment BC from the other points on the ray.