License & how to cite

Teachers, students, librarians, and schools are welcome to copy, print, remix, and redistribute this material. Here is exactly what you may do with each part of the site, and the credit line to use.

Diagrams and printable formula sheets — CC BY-SA 4.0

Every shape diagram, and every formula sheet produced by the Sheet Builder, is released under Creative Commons Attribution-ShareAlike 4.0 International. Share and adapt them for any purpose, including commercially — just credit the source and release your adaptation under the same license.

Page content — CC BY-NC-SA 4.0

The written material — explanations, worked examples, FAQ answers, and the glossary, in both English and Spanish — is released under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International. Classroom, tutoring, library, and non-profit educational use is exactly what this is for. For commercial licensing, email hello@geometryformula.com.

Source code — MIT

The compute engine that powers every formula, explorer, and worked example is MIT licensed and free for any use, commercial included.

What isn’t covered

Official state and national exam reference sheets (NYSED, TEA, VDOE, PDE, College Board, ACT) are linked on the exam preset pages as primary sources — they are not hosted or relicensed here, and every sheet we serve is generated from our own verified data. KaTeX and its fonts carry their own licenses. The name and logo are not covered by the licenses above.

Attribution

The credit line for either license:

GeometryFormula.com — https://geometryformula.com — CC BY-SA 4.0

As HTML, ready to paste:

<a href="https://geometryformula.com/">GeometryFormula.com</a> — <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>

Citing a page

MLA:

"Cone — Volume and Surface Area." GeometryFormula.com, https://geometryformula.com/cone/. Accessed 16 Aug. 2026.

APA:

GeometryFormula.com. (2026). Cone — volume and surface area. https://geometryformula.com/cone/

Embedding a widget

Any explorer can be embedded in a class site, LMS page, or blog post with one line of HTML — no account, no watermark. The full gallery is at /embed/.

<iframe src="https://geometryformula.com/embed/cone/" width="100%" height="520" style="border:0" loading="lazy" title="Cone volume and surface area explorer"></iframe>

Questions

If you’re not sure whether your use is covered, just ask — hello@geometryformula.com. The answer for teaching use is almost always yes.