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 Girls’ Angle Bulletin, Volume 9, Number 1
 Girls’ Angle BacktoSchool Puzzle Raffle
 Girls’ Angle Bulletin, Volume 8, Number 6
 Origamiinspired Proof of the Pythagorean Theorem
 Girls’ Angle Bulletin, Volume 8, Number 5
 Conceptual Solution to 2008 AIME I, Problem 14
 Girls’ Angle Bulletin, Volume 8, Number 4
 Snowball Problems Melted
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 Girls’ Angle Bulletin, Volume 8, Number 3
 We’ve Got Snowball Problems
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Tag Archives: area
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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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
Manipulatives: Use With Caution!
Math manipulatives are concrete objects used as props in math education. As mere objects, they are, in and of themselves, not a bad thing. What is terrible is how they are often used in instruction.
Areas and Brownies
Recently at Girls’ Angle, we brought in a brownie and told the girls that nobody could have any until they figured out a way to dissect it so that everyone gets an equal share. I’ve done this activity before, but … Continue reading
Posted in math, Math Education
Tagged area, brownie, geometry, Petsi Pies, quadrilateral
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3D Trapezoids
A few days ago, I was discussing the area formula for a trapezoid with students who had just derived it for themselves. The discussion led to a neat generalization of the trapezoid to higher dimensions different from the one that envisions the 3D … Continue reading