# Category Archives: Geometry

## An angle inscribed in a semicircle

Hereis a tweet with a nice proof of the theorem that is the namesake of this website https://twitter.com/professorbrenda/status/1323095111954288640?s=21

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## Roots of Unity

on GeoGebra https://www.geogebra.org/m/sZFwAZfs

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## Hidden Figures Curriculum for Schools

Check out http://mentalfloss.com/article/94297/hidden-figures-coming-classrooms Free download of a curriculum based on the movie Hidden Figures.

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## Free Worksheets site – Kuta

https://www.kutasoftware.com/freeipa.html

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## Memoranda Mathematica: A Synopsis of Facts, Formulae, and Methods (1912 book)

At this the MathFest (Washington DC 2015) lecture by Richard Guy and John Conway I learned of a book from 1912. Probably only of interest to math geeks. (yep math geek alert) I find it interesting that this reference book … Continue reading

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## Great Reference Sheets (Math)

EEWeb has a very good Math Help page with numerous Quick Reference Sheets Algebra – Properties Geometry – Shapes and Solids Trigonometry – Definition (has unit circle) Trigonometry – Laws and Identities Calculus – Derivatives and Limits Calculus – Integrals … Continue reading

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## Spotting Numbers and Visual Patterns

Here a two great websites that provide lots of great pattern problems. Spotting Numbers Visual Patterns These patterns can be used with elementary students (if you just ask number questions) through advanced algebra (if you include questions about functions). Mathematics … Continue reading

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## On Symmetries of an Icosahedron

http://math.ucr.edu/home/baez/six.html http://math.ucr.edu/home/baez/week79.html Click to access kostant.pdf http://www.ams.org/notices/199509/index.html symmetries of the cube: https://www.math.lsu.edu/~verrill/teaching/discrete2020/Spring2005/cubesolution.pdf http://www.ams.org/samplings/feature-column/fcarc-cubes7

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