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 Girls’ Angle Bulletin, Volume 7, Number 3
 Intuiting the Chain Rule
 WIM Video: Pick’s Theorem
 Do you believe this?
 Happy New Year!
 Girls’ Angle Bulletin, Volume 7, Number 2
 2013 AIME 2 Problem 10
 Girls’ Angle Bulletin, Volume 7, Number 1
 Uncritical Thinking
 Hidden Math Crossword
 Girls’ Angle Bulletin, Volume 6, Number 6
 Why is the area under one hump of a sine curve exactly 2?
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Author Archives: girlsangle
Girls’ Angle Bulletin, Volume 7, Number 3
The electronic version of the latest issue of the Girls’ Angle Bulletin is now available on our website. Much of this issue is about the center of mass, including Julia Zimmerman’s cover drawing which features a mobile fantasy. In Math … Continue reading
Posted in math, Math Education
Tagged center of mass, gravity, Karen Smith, law of the lever, mass points, mobiles, vectors, WallaceBolyaiGerwien theorem, x to the x
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Intuiting the Chain Rule
If you’ve just learned the chain rule but feel that you have no intuition for it, this post might help. Recall that the chain rule tells us how to compute the derivative of a composite function. Specifically, suppose and are … Continue reading
WIM Video: Pick’s Theorem
In our latest WIM Video, Depaul University Associate Professor of Mathematics Bridget Tenner discusses Pick’s theorem. The Girls’ Angle WIM Video series is the brainchild of Girls’ Angle director Elisenda Grigsby. WIM Videos are often shot on the spur of the moment … Continue reading
Posted in math, Math Education, WIM videos
Tagged area, Bridget Tenner, equilateral triangles, lattice polygons, Pick's theorem
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Do you believe this?
Here’s a triangle: I’ll use the vertex labels to also denote the corresponding angle measures. Take the sines of all 3 angles in the triangle: , , and . Would you believe it if I told you that these three … Continue reading
Posted in Contest Math, math
Tagged law of cosines, Ptolemy's theorem, similarity, sine, triangles, trigonometry
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Happy New Year!
How many dots are in the base?
Girls’ Angle Bulletin, Volume 7, Number 2
The electronic version of the latest issue of the Girls’ Angle Bulletin is now available on our website. In Bisection Envelopes, a paper to appear in the journal Involve, Noah FechtorPradines proves many interesting properties of the envelope of the set of … Continue reading
2013 AIME 2 Problem 10
I’ve been asked about the following problem from the 2013 AIME 2 a few times, so I decided to blog a couple of solutions for it: Given a circle of radius , let A be a point at a distance from … Continue reading
Girls’ Angle Bulletin, Volume 7, Number 1
The electronic version of the latest issue of the Girls’ Angle Bulletin is now available on our website. The cover shows an example of (quasi) selfsimilarity in nature: the Romanesco broccoli, and alludes to this issue’s Math Buffet. Flip over … Continue reading
Posted in math, Math Education
Tagged Aaron Lee, Anna Frebel, Anne Shiu, Antony Orth, comet ISON, Conic Sections, Fibonacci, golden rectangle, selfsimilarity, zeroes
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Uncritical Thinking
A friend sent me the challenge at right that his daughter was given in school. What would you answer?
Hidden Math Crossword
(The contest is now closed. Congratulations to Rebecca W. and Carly R. Rebecca will receive an Intel web computer and Carly will receive chocolate from L. A. Burdick. Thanks to all who tried this crossword. We hope it was enjoyable.) … Continue reading