30 June 2017

*y* = *ax*^{2} + *bx* + *c* is a parabola. Changing the variables *a* and *c* are fairly simple, but what does *b* actually change, and by how much?

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Posted in Mathematics **|**

Tags: Graphs, Interactive

9 May 2017

This interactive applet allows you to explore the concepts of domain and range for several different mathematical functions.

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Posted in Mathematics **|**

Tags: Graphs, Interactive

19 February 2017

Self-taught mathematician and astronomer Benjamin Banneker excelled despite little formal education and prejudice.

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Posted in Math movies **|**

Tags: Culture, Real-world math

29 January 2017

Here we solve another graph mystery - what is the correct domain for y = sec(arccos(x))? And why do different software packages show similar, but different graphs?

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Posted in Mathematics **|** 5 Comments »

Tags: Graphs, Math notation, Technology

3 September 2016

The *Manga Guide to Regression Analysis *continues the tradition of presenting math through comics. Here's my review.

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Posted in Learning mathematics **|** 3 Comments »

Tags: Culture, Real-world math, Reviews

29 August 2016

I was humbled this week to receive notice that SquareCirclez (the IntMath Blog) has been included in a list of the "Top 100 Math Blogs".

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Posted in Mathematics **|**

Tags: Technology

10 July 2016

The fascinating Map to Multiplication may not be all it seems, notwithstanding its cleverness.

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Posted in Mathematics **|** 5 Comments »

Tags: Graphs, Interactive

28 June 2016

This 3D planes applet allows you to explore the concept of geometrically solving 3 equations in 3 unknowns.

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Posted in Mathematics **|** One Comment »

Tags: Graphs, Interactive, Technology

25 May 2016

This interactive applet allows you to explore the concept of slicing a cone by a plane at various angles and positions, resulting in conic sections.

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Posted in Mathematics **|** One Comment »

Tags: Graphs, Interactive, Technology

19 April 2016

Ancient rock art may give clues to the origin of written symbols, including early math notation.

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Posted in Math movies **|** One Comment »

Tags: Culture, Math notation