Search Me

Recent Posts
 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?
Categories
 applied math (2)
 Contest Math (23)
 gender issues (9)
 math (79)
 Math Education (69)
 Uncategorized (12)
 WIM videos (4)
Archives
 February 2014 (1)
 January 2014 (4)
 December 2013 (1)
 November 2013 (2)
 September 2013 (2)
 August 2013 (1)
 July 2013 (2)
 June 2013 (1)
 May 2013 (1)
 April 2013 (3)
 March 2013 (1)
 February 2013 (2)
 January 2013 (2)
 December 2012 (2)
 November 2012 (2)
 October 2012 (3)
 September 2012 (8)
 August 2012 (10)
 July 2012 (7)
 June 2012 (3)
 May 2012 (3)
 April 2012 (7)
 March 2012 (4)
 February 2012 (3)
 December 2011 (4)
 November 2011 (7)
 October 2011 (11)
 September 2011 (13)
 August 2011 (16)
Everything Math
Aaron Lee AIME angles arctangent area calculus CEO chocolate circles Coach Barb combinatorics complex numbers computation conformal Conic Sections coordinates crossword dates distance divisibility Emily Riehl errors exponentials Fermat's little theorem GaussWilson geometry Girls' Angle Girls' Angle Bulletin girls and math infinite geometric series Jean Pedersen Julia Zimmerman learning linear algebra math math contests Math Doctor Bob mathematicians math event math games math magazine math prize for girls math problems math trivia math videos matrices mental computation optimization origami parabolas perpendicular perspective drawing puzzle Pythagorean theorem Pythagorean triples quadratic Radmila Sazdanovic raffle contest roots science secret messages similarity sine stable marriage algorithm stable marriage problem sumit sums of powers tennis triangles trigonometry USWIM variables Vieta's formulas volume Women's History Month
Tag Archives: geometry
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
The Pythagorean Theorem: Is It Proven?
Recently at the Girls’ Angle club, a girl asked: Has the Pythagorean theorem been proven? That was a terrific question! Unfortunately, I didn’t have time to discuss it as well or as fully as I would have liked. A lot of … Continue reading
Posted in math
Tagged geometry, math, noneuclidean geometry, proof, Pythagorean theorem, science
2 Comments
Bouncing in a UShaped Gallery
Consider the Ushaped hallway illustrated above. All angles are right angles and the numbers indicate the lengths of various walls. The figure is not drawn to scale. The problem is to send a point sized billiard ball located at the … Continue reading
OneFold Origami Puzzle Raffle – Solution
Congratulations to Philip H. for winning the OneFold Origami Puzzle Raffle! Many thanks to all who participated! Here is Philip’s solution:
Use Your Mind to Save Yourself Time
I’m looking forward to Games Night at the Math Prize for Girls coming up this weekend. I’ve been working with the author of “Mess or Math?” to create a really fun math activity and I hope many of you who … Continue reading
Posted in Contest Math, math, Math Education
Tagged AMC 12, circles, circumference, geometry, similarity, tangent circles
Leave a comment
Two Lady Bug Path Problems
The other day, I noticed a bunch of lady bugs walking in the grooves of a tiled floor.
Posted in math, Math Education
Tagged distance, geometry, optimization, paths, taxicab metric
1 Comment
A Geometric Iteration with a SylvesterGallai Guarantee
Posted in math, Math Education
Tagged geometry, iteration, lines, midpoints, points, SylvesterGallai
Leave a comment
OneFold Origami Puzzle Raffle
This raffle is closed. Congratulations to Philip H. for being selected the lucky winner. Many thanks to all who participated! Here’s a chance for you for some chocolate from L. A. Burdick!
Getting Pythagorean Triples with Hyperbolic Functions
In addition to parametrizing rational points on the unit circle, the matrix method, and onefold origami, here’s a way to get the Pythagorean triples using the hyperbolic sine, cosine, and tangent.
Posted in math, Math Education
Tagged cosh, geometry, hyperbolic functions, Pythagorean triples, sinh, tanh
Leave a comment