As a personal study to understand the basic construction of regular geometric shapes with only a compass and ruler, I found it hard to remember each step. Animating the process seemed like the best way to document for future reference. Geometric construction by Adam Ploff.
Three circles of unit radius and centered at $\left ( 0,1.5 \right )$, $\left ( 0,1.5 \right )$, and $\left ( 2,0 \right )$ are shown in dark blue color in the attached figure. The set of all circles that are tangent to all three of the given circles are drawn. What is the radius of the second largest such circle? What is the least perimeter of an isosceles triangle in which a circle radius $\sqrt{3}$ can be inscribed? Do you have a solution? If so, submit it at http://www.calculushumor.com/submityoursolution.html!
Margaret Wertheim leads a project to recreate the creatures of the coral reefs using a crochet technique invented by a mathematician — celebrating the amazements of the reef, and deepdiving into the hyperbolic geometry underlying coral creation. TranscriptI'm here today, as June said, to talk about a project that my twin sister and I have been doing for the past three and half years. We're crocheting a coral reef. And it's a project that we've actually been now joined by hundreds of people around the world, who are doing it with us. Indeed thousands of people have actually been involved in this project, in many of its different aspects. It's a project that now reaches across three continents, and its roots go into the fields of mathematics, marine biology, feminine handicraft and environmental activism. It's true. It's also a project that in a very beautiful way, the development of this has actually paralleled the evolution of life on earth, which is a particularly lovely thing to be saying right here in February 2009  which, as one of our previous speakers told us, is the 200th anniversary of the birth of Charles Darwin. 
PollOriginsThis started as a way to express the admins' love of calculus and math in general. As result, this has turned into a gathering place for mathbased humor and weekly challenges. This work by Calculus Humor is licensed under a Creative Commons AttributionNonCommercialShareAlike 3.0 Unported License. Archives
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