Category Archives: math

Girls’ Angle Bulletin, Volume 7, Number 6

The electronic version of the latest issue of the Girls’ Angle Bulletin is now available on our website. The cover illustrates a neat result that Anna B. discovered and explains in this issue’s Anna’s Math Journal. She continued her investigation of … Continue reading

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Marion Walter’s Theorem Via Mass Points

I recently had the good fortune of learning Marion Walter’s theorem from Marion Walter herself: Marion Walter’s Theorem: In a triangle, draw line segments from each vertex to the trisection points on the opposite side. The six drawn line segments … Continue reading

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Girls’ Angle Bulletin, Volume 7, Number 5

The electronic version of the latest issue of the Girls’ Angle Bulletin is now available on our website. A paraboloid of revolution adorns the cover. Anna investigates cross sections of paraboloids in this issue’s Anna’s Math Journal. It sure feels like … Continue reading

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Cubes in one-point perspective

This post is a reply to Jamie’s comment on Drawn to Math: Would anyone know how to construct a cube in one point perspective? This is an excellent question because it isolates an important, simplified situation that enables one to study key aspects of … Continue reading

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Girls’ Angle Bulletin, Volume 7, Number 4

The electronic version of the latest issue of the Girls’ Angle Bulletin is now available on our website. The cover features a planar configuration by Leah Berman, associate professor of mathematics at the University of Alaska Fairbanks.  There are 240 … Continue reading

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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

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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

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