OOPS!

2014-05-26

After adding a new plugin to the site, all of my plugins were deactivated and unavailable. I had to re-install the entire site from backup, only it wouldn’t take the whole backup, so I had to do it piecemeal. For some reason, the users were not in the backup, so if you signed up before, you will need to again. If you find anything that looks funky, let me know.

Quite often, when doing calculations on polyhedra, you will find yourself with complex equations like $$\begin{equation}\tag{eq1}\label{eq1}\frac{20+7\sqrt3}{1+2\sqrt3}\end{equation}$$ Is the top evenly …Read the Rest

sqr(A+B*sqr(C))

2013-07-27
sqr(A+B*sqr(C))

Lately, I have been doing a lot of math involving square roots of numbers added to square roots, in the …Read the Rest

SketchUp Platonics

2012-01-24
SketchUp Platonics

I’ve been playing with Google’s Sketchup for a week or so and I had the thought of doing some polyhedra. …Read the Rest

Octahedron

2011-11-07
Octahedron

The octahedron is a Platonic solid, which means it is made of all regular polygons for each face, being eight …Read the Rest

Law of Sines and Cosines

The law of cosines relates the sides and angles of a triangle. \(a^2=b^2+c^2-2bc\cdot \cos\alpha \\ b^2=a^2+c^2-2ac\cdot \cos\beta \\ c^2=a^2+b^2-2ab\cdot \cos\gamma\) …Read the Rest

The Cube

2011-10-28
The Cube

The cube is probably the most recognized and best known of and 3D shape. Kids young enough not to even …Read the Rest

Phi, the Golden Ratio

Phi \((\Phi, \phi)\) is a Greek letter that mathematicians have assigned to a specific ratio or proportion, called the golden …Read the Rest

Table of exact trigonometric functions

Since I noticed I had to keep looking some of these up, I place them here, just for reference, gathered …Read the Rest

22 miles straight up in 90 seconds

I may not involve geodesic shapes, but sure is awesome. http://hackaday.com/2011/10/10/22-miles-straight-up-in-90-seconds/ This is not a “because we can” moment, it …Read the Rest

An unequal pyramid

2011-10-11
An unequal pyramid

Last post, I worked on the vertex edge angles of a triangular pyramid that had all equal angles originating from …Read the Rest