# Constructions

Geometric Constructions ... **Animated!**

"Construction" in Geometry means to draw shapes, angles or lines accurately.

These constructions use only compass, straightedge (a ruler, but not using the numbers) and a pencil.

This is the "pure" form of geometric construction: no numbers involved!

## Basics

Learn these two first, they are used a lot:

## Points and Lines

## Angles

And it is useful to know how to do 30°, 45° and 60° angles. We can use the angle bisector method (above) to create other angles such as 15°, etc.

## Triangle Basics

## Triangle Centers

## Circle Basics

## Circles and Tangents

## Polygons

And for the "Master Class":

(Note: You can also see how to Use the Drafting Triangle and Ruler, Use the Protractor, and How to construct a Triangle With 3 Known Sides, but they are not "pure" geometric constructions.)