Search Me

Recent Posts
 Girls’ Angle Bulletin, Volume 9, Number 5
 Girls’ Angle Bulletin, Volume 9, Number 4
 Girls’ Angle Bulletin, Volume 9, Number 3
 Math Collaborations
 Happy New Year 2016!
 Girls’ Angle Bulletin, Volume 9, Number 2
 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
Categories
 applied math (3)
 Contest Math (24)
 gender issues (9)
 math (99)
 Math Education (81)
 Uncategorized (19)
 WIM videos (4)
Archives
 June 2016 (1)
 April 2016 (1)
 February 2016 (2)
 January 2016 (1)
 December 2015 (1)
 October 2015 (1)
 September 2015 (1)
 August 2015 (2)
 June 2015 (2)
 May 2015 (1)
 April 2015 (1)
 March 2015 (1)
 February 2015 (2)
 January 2015 (1)
 December 2014 (2)
 October 2014 (1)
 September 2014 (1)
 August 2014 (1)
 July 2014 (1)
 June 2014 (2)
 May 2014 (1)
 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
AIME angles arctangent area calculus CEO chocolate circles Coach Barb combinatorics complex numbers conformal crossword cubes dates derivative divisibility Emily Riehl exponentials Fermat's little theorem finite fields geometry Girls' Angle Girls' Angle Bulletin girls and math infinite geometric series irreducible polynomials Jean Pedersen Julia Zimmerman Kate Jenkins learning linear algebra mass points math math contests Math Doctor Bob mathematicians math event math games math magazine math prize for girls math problems math trivia math videos mental computation multiplication optimization origami palindromes parabolas permutations perspective drawing probability puzzle Pythagorean theorem Pythagorean triples quadratic raffle contest roots science secret messages similarity sine stereographic projection sumit tangent telescoping sum tennis triangles trigonometry USWIM variables Vieta's formulas volume Women's History Month
Tag Archives: similarity
Cubes in onepoint 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
Posted in applied math, math
Tagged cubes, geometry, onepoint perspective, perspective drawing, similarity
Leave a comment
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
Leave a comment
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
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
Posted in math, Math Education
Tagged complex numbers, geometry, number plane, parallelogram law, similarity, square root of 1
2 Comments
Similarity Simplifies
When you see that two figures are similar to each other, everything becomes simpler. Suddenly, you realize that if you understand one figure, you know everything about the other, except for its absolute size. I was observing some students solving … Continue reading
Posted in Contest Math, math, Math Education
Tagged geometry, Pythagorean theorem, similarity
1 Comment
Circles, Squares, and Parabolas
If you take two circles, you can position them before your right eye in such a way that one will perfectly overlap the other. In other words, a circle is geometrically similar to all other circles. The same is true … Continue reading