# mathmonday

### Vi Hart Throws a Triangle Party

Our favorite "mathemusician" Vi Hart has a wonderful new video out today exploring my favorite polygon, the triangle. I loved the comment on her Facebook posting of the video: "This...

Posted by Gareth Branwyn | Thursday December 8th, 2011 3:09 PM

Categories: Art & Design, Science | No Comments

### Math Monday: Four Triangles Again

Last week's Math Monday column looked at a tricky construction of four equilateral triangles. Let's revisit it, but instead of using paper, we'll use square sticks. These twelve identical wood...

Posted by Gareth Branwyn | Monday December 5th, 2011 12:00 PM

Categories: 3D Printing, Woodworking | No Comments

### Math Monday: Four Paper Triangles

What could sound easier than to make a regular construction from four paper equilateral triangles? One possible construction is the regular tetrahedron, which is pretty easy. Here is a different...

Posted by Gareth Branwyn | Monday November 28th, 2011 12:00 PM

### Math Monday: An Octahedron in a Balloon

You may know how to make a ship in a bottle, but how would you make this octahedron in a balloon? The twelve edges of the octahedron are made of...

Posted by Gareth Branwyn | Monday November 21st, 2011 12:00 PM

Categories: Craft, Science | No Comments

### Math Monday: Light Stick Construction

Inexpensive light sticks can be held together with rubber bands to make glowing geometric structures. Here's a construction based on the truncated dodecahedron, with a tetrahedron over each triangle. Assembling...

Posted by Gareth Branwyn | Monday November 14th, 2011 12:16 PM

Categories: Craft, Hackerspaces, Science | No Comments

### Math Monday: String Hyperboloid

A string hyperboloid can be made by running strings between two circles and rotating one relative to the other. Here's one large enough to stand inside of---it is fourteen feet...

Posted by Gareth Branwyn | Monday November 7th, 2011 12:00 PM

Categories: Craft, Science | 3 Comments

### Math Monday: Tensegrity Balls

Here is a bouncy structure made of dowels and rubber bands in which no sticks directly touch each other. The compression members are not connected, yet the entire structure supports...

Posted by Gareth Branwyn | Monday October 24th, 2011 12:00 PM

### Math Monday: Pentominoes

A pentomino is like a domino, but it has five connected squares instead of two. There are twelve ways to connect squares edge-to-edge in the plane, not counting rotations and...

Posted by Gareth Branwyn | Monday October 17th, 2011 12:00 PM

Categories: Science, Woodworking | No Comments

### Math Monday: Candy Pi Calculator

There are many ways to calculate an approximation to pi, but rarely is math as delicious as in this idea from Davidson College professor Tim Chartier. Make a quarter circle...

Posted by Gareth Branwyn | Monday October 10th, 2011 12:00 PM

### Math Monday: Flexible Stick Structures

Bradford Hansen-Smith has been experimenting with structures made from a great many 10-inch bamboo skewers held together with short pieces of rubber tubing. He calls the technique Stickweaving and presents...

Posted by Gareth Branwyn | Monday October 3rd, 2011 12:00 PM

Categories: Craft, Science | No Comments

### Vi Hart on "What is Up with Noises?"

The amazing Vi Hart (daughter of our Math Monday columnist George Hart) has blown our minds again with this over 12 minute video explaining the math, science, and art behind...

Posted by Gareth Branwyn | Monday September 26th, 2011 9:00 PM

Categories: Education, Music, Science | No Comments