Category Archives: Mathematics

The dominant topic of my blog. You figured that out from the blog’s name, though, right?

Mandala with Golden Rectangles

Image

Reply

Mandala with Golden Rectangles

Eight Golden Spirals

Image

Reply

Eight Golden Spirals

Overcrowding At Sunset

Image

Reply

Overcrowding At Sunset

Thanks to my friend Judy for selecting the title. =)

Mandala Based On Sixty

Posted on by
Reply

Image

That’s the finished mandala. These are made using MS-Paint and Geometer’s Sketchpad, and I use Sketchpad first. Here’s what it looked like at the half-way point:

Image

Interfering Ripples

Image

Reply

Interfering Ripples

Spiderweb Crime Scene

Image

Reply

spiderweb crimescene

Hexadecagon with Diagonals

Image

Reply

Hexadecagon with Diagonals

Cats in a Rotating Dodecahedron

Image

Reply

Cats in a Rotating Dodecahedron

I made this using “Stella 4d” — software you can download and try, for free, at http://www.software3d.com/stella.php

Pentagonal Mandala

Image

Reply

Pentagonal Mandala

Euclidean Construction of the Regular Pentagon

Posted on by
Reply

It’s not the same one you can easily find in textbooks.

Image

 

[Later edit] For a step-by-step explanation of this construction, see this post: https://robertlovespi.wordpress.com/2014/08/10/a-euclidean-construction-of-a-regular-pentagon-with-a-given-edge-length/.