The following Java applets were generated using C.a.R.; some of them are equvalent to the exercises in Euclidea — a cool collection of interactive geometric puzzles.

Since in all major browsers the support for Java plugins has ended,
we recommend to install Java Developers Kit (JDK) and open the exercises using the command `appletviewer url...`

.
for example, to open the first exercise you use the following command:

`appletviewer http://anton-petrunin.github.io/birkhoff/car/Angle%20bisector.html`

On windows, before executing the command, you may need to navigate to the folder with `appletviewer`

, it should be something like
`C:\Program Files\Java\jdk1.8.0\bin`

- Perpendicular lines
- Angle bisector or 2.1 in Euclidea
- 5.21. Perpendicular or 2.6 in Euclidea
- 5.22. Center of the circle or 1.6 in Euclidea
- 5.23. Tangents to the circle
- 5.24. Tangent circle

- Parallel lines and similar triangles
- 7.5. Parallel line or 5.1 in Euclidea
- 7.9. Segment trisection or 10.6 in Euclidea

- Triangle geometry
- Inscribed angles
- 9.7. Right angles
- 9.9. Perpendicular with ruler
- 9.21. Equal angles

- Inversion
- 10.5. Inversion
- 10.23. Perpendicular circles

- Hyperbolic plane
- Affine geometry
- (14.3.) Segment bisection
- Affine segment trisection
- 14.4. Arithmetic construction
- 14.5. Center with parallel tool

- Projective geometry
- 15.11a. Third parallel line
- 15.11b. Three pairs of parallel lines

- Geometric constructions
- 19.3. Simplified Apollonius's problem
- (19.15.) Tangents to the circle with ruler
- 19.16. Center of concentric circles