Monthly Archives: July 2012

The Number Plane

If you’ve got an adventurous spirit and are happy not knowing where things may be going, I suggest skipping the blue paragraph and going straight to The Number Line. We present a geometric approach to introducing complex numbers. The approach … Continue reading

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Happy Pi Day!

No, it’s not March 14. But it is July 22, and that’s the day Girls’ Angle likes to celebrate Pi Day. Why?

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Uneasy about math competitions for girls

[This post was contributed by Lauren McGough, Girls’ Angle mentor, advisor,  and treasurer. She just graduated from MIT and will be entering Princeton’s doctoral program in physics this fall.] Last October, I was at the annual Girls’ Angle Chocolate Soirée, … Continue reading

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An Amusing Determinant

A student and I were playing with determinants recently and we stumbled upon an amusing one. I have a very strong feeling that this must have been stumbled upon many times in the past so we’re making no claim to … Continue reading

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“Parabolas of Apollonius?” Spoiler

This is an answer to the question posed in Parabolas of Apollonius? which was inspired by Maria Monk’s blogpost on the Circles of Apollonius.

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Parabolas of Apollonius?

This question is inspired by Maria Monks’ blog post on the Circles of Apollonius. Pictured above are some parabolas from two families of parabolas. The Blue Family is given by the parabolas , for . The Red Family is given … Continue reading

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Girls’ Angle Bulletin, Volume 5, Number 5

Counting problems seem to keep popping up at Girls’ Angle lately.  That’s why we included Shravas Rao’s introduction to permutations and combinations in the last issue of the Bulletin, and that’s why you’ll find a 2 page Summer Fun problem … Continue reading

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