Best of the Web. Picked by our PhDs
A visualization of the many, many known digits of the number π. There's just…so many of them…
A Sesame Street video featuring the music of Philip Glass. Some interesting properties of circles show up in the animation. See if you can follow along and describe what's being constructed.
This is a short animation visualizing where π comes from. No, not the bakery.
Watch this guy derive the equation for a circle from the distance formula.
Put on your hard hat; there's some construction going on here. Today's project: a line tangent to a given circle.
Games and Tools
In this game, you'll use what is essentially a 2D version of GPS to find a lost astronaut. Circles can save your life, you see.
Match the circle-related term to its definition as fast as you can.
These terminology questions are designed to trip you up. Let logic be your walking stick.
You'll know the answers to some of these circle-related questions right away. Others may actually make you think for a few minutes.
A Jeopardy-style review game that'll make sure you know all the answers…er, questions…when it comes to circles.