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Geometry

Explore shapes, angles, areas and volumes, and learn to construct and prove with interactive tools.

21 free sites · 17 in English.

1. Khan Academy – Geometry English khanacademy.org

   Full course with videos and exercises.

   For: Middle & high schoolCollege

2. Math is Fun – Geometry English mathsisfun.com

   Shapes, angles, area and volume explained.

   For: Elementary schoolMiddle & high school

3. Math Open Reference English mathopenref.com

   Geometry reference with interactive animations.

   For: Middle & high school

4. Mathplanet – Geometry English mathplanet.com

   Free online high-school geometry course.

   For: Middle & high school

5. CK-12 – Geometry English ck12.org

   Free textbook and interactive practice.

   For: Middle & high school

6. Corbettmaths English corbettmaths.com

   Geometry videos and worksheets.

   For: Middle & high school

7. Euclid’s Elements (D. Joyce) English mathcs.clarku.edu

   The classic, online and illustrated.

   For: Middle & high school

8. Byrne’s Euclid English c82.net

   A beautiful color edition of Euclid’s first six books.

   For: Middle & high school

9. Wikibooks – Geometry English en.wikibooks.org

   Free, open geometry textbook.

   For: Middle & high schoolCollege

10. Wolfram MathWorld English mathworld.wolfram.com

    Encyclopedia of formulas and figures.

    For: College

11. Cut the Knot English cut-the-knot.org

    Proofs and geometric curiosities.

    For: Middle & high school

12. Art of Problem Solving – Wiki English artofproblemsolving.com

    Theorems and competition problems.

    For: Middle & high school

13. LibreTexts – Mathematics English math.libretexts.org

    Open textbooks for geometry and beyond.

    For: College

14. Brian McLogan (YouTube) English youtube.com

    Geometry lessons step by step.

    For: Middle & high school

15. The Organic Chemistry Tutor (YouTube) English youtube.com

    Geometry problems worked out.

    For: Middle & high schoolCollege

16. GeoGebra – Geometry Multilingual geogebra.org

    Ruler-and-compass constructions in the browser.

    For: Middle & high school

17. GeoGebra 3D Multilingual geogebra.org

    Solids and surfaces in 3D.

    For: Middle & high school

18. Desmos – Geometry Multilingual desmos.com

    Dynamic geometry tool.

    For: Middle & high school

19. Math Open Ref – Constructions English mathopenref.com

    Animated compass-and-straightedge constructions.

    For: Middle & high school

20. Polypad (Amplify) Multilingual polypad.amplify.com

    Polygons, tessellations and transformations.

    For: Elementary schoolMiddle & high school

21. Mathispower4u (YouTube) English youtube.com

    Short worked geometry examples.

    For: Middle & high schoolCollege