Intersection of 3 planes at a point: 3D interactive graph

28 June 2016

solution of a system of 3x3 equations is intersection of 3 planes
This 3D planes applet allows you to explore the concept of geometrically solving 3 equations in 3 unknowns.

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Conic sections interactive applet

25 May 2016

Conic sections interactive applet
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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Geometric shapes in ancient rock art paintings

19 April 2016

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

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New 3D interactive graph

13 April 2016

3D interactive graph applet - background
I recently added a 3D interactive graph which you can use to explore the x-, y- and z-axis system.

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Roller Door Problem and Polymath Software

3 April 2016

polymath roller door problem
Here's a numerical solution to an earlier problem we discussed involving a roller door.

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How to find the equation of a quintic polynomial from its graph

26 March 2016

Given a quintic curve, how to find the function?
A quintic curve is a polynomial of degree 5. Given such a curve, how do you work backwards to find the original function expression?

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Squaring the circle - a reader’s approach

12 February 2016

Squaring the circle
Here's a reader's approach to the age old problem of finding a square with the same area as a given circle, called "squaring the circle"

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Math movie: How to play a Rubik’s Cube like a piano

9 December 2015

How to play a Rubik’s Cube like a piano - Michael Staff
This movie explores the connections between Rubik's cube and the group theory concepts behind music.

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Butterfly map of the world

8 December 2015

Butterfly map of the world
The butterfly map of the world is based on Reuleaux triangles. This article explores some of the story behind this interesting map.

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Reuleaux triangles

8 December 2015

Reuleaux triangles
Reuleaux triangles have a property similar to circles - they have constant diameter when rotated.

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