CaR or Compass and Ruler is a free dynamic geometry software written in Java by Rene Grothman. The CaR window is shown below.

The upper part of the window contains the menu bar and toolbar. The toolbar contain tools in constructing and editing mathematical objects. The left window below the toolbar is the *Objects window* and the right pane is the *Drawing pad* where we construct drawings.

**Tutorial 1 – Constructing an Isosceles Triangle**

In the first tutorial, we are going to create an isosceles triangle by using the center of the circle and two points on its circumference.

Congratulations, you have finished the first Compass and Ruler tutorial.