You may have noticed that we've launched wiki pages in our practice section. We've got over 100 pages already up and running but we need your help to make these pages a resource that will make Brilliant.org an even better place to improve at math, science, and problem solving.

If you'd like to try your hand at explaining a challenging/interesting concept to tens of thousands of other people all around the world, read on!

Our wiki pages are meant to help people who have forgotten (or have never learned) about a particular skill or technique. Our best pages will have:

- a brief and understandable summary of the idea/technique
- additional explanation, if it would be helpful or provide added depth
- some worked examples so readers can see the idea in action

However, any contributions you can make are welcome, as we want to work as a community to improve this resource over time. Here are a couple of examples of some more-developed pages:

So, if you'd like to help, here are some pages that could use your contributions:

- Combinatorics - Symmetric Difference
- Coordinate Geometry - Focus and Directrix of a Parabola
- Calculus - Volume of Revolution using the Shell Method
- Calculus - Finding Surface Area

Created (but feel free to edit/improve):

- Geometry - Properties of Regular Polygons — created by Jaydee Lucero
- Coordinate Geometry - Section Formula — created by Christopher Boo
- Trigonometric Identities - Sum and Difference Formula — created by Lol Nope

Of course, feel free to look around and contribute anywhere else you'd like as well!

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$</code> ... <code>$</code>...<code>."> Easy Math Editor

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boldNote: you must add a full line of space before and after lists for them to show up correctlyparagraph 1

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## Comments

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TopNewestAdded stuff to: Trigonometric Identities - Sum and Difference Formula

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Can messaging among allowed members be enabled on brilliant?

Please do that. It would be helpful.

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Added stuff to: Probability- Rule of product. The Brilliant Staff can add more problems to it. (generally the problems are of Level 1)

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