# Intro to Geogebra

- Author:
- Max Bennett

## What is Geogebra?

Geogebra is an online tool that we can use to help us with Geometry.

## Shapes in Geogebra

Here are a few different shapes made in Geogebra. Move the points that are blue around, and see what happens.

## What can you do with Geogebra?

Geogebra allows us to create geometric shapes, measure them, and manipulate them.

## Make lines

- Make a
__line__that goes through points A and B. - Make a
__segment__that goes through points C and D. - Make a
__ray__that starts at E and passes through F.

## Make circles.

Make a circle in three different ways.

- Make a circle with a centre that goes through a point.
- Make a circle with a centre and a radius of 2.
- Make a circle that goes through three points.

## Measure lines

Select the Distance or Length tool.
Now click on the point A, and then B.

## Measure angles

Below are points A, B and C. Find ABC with the Angle tool by clicking A, B then C.