Circles Resources
Best of the Web. Picked by our PhDs
Websites
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A visualization of the many, many known digits of the number π. There's just…so many of them…
Videos
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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.
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This is a short animation visualizing where π comes from. No, not the bakery.
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Watch this guy derive the equation for a circle from the distance formula.
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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
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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.
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Match the circle-related term to its definition as fast as you can.
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These terminology questions are designed to trip you up. Let logic be your walking stick.
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You'll know the answers to some of these circle-related questions right away. Others may actually make you think for a few minutes.
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A Jeopardy-style review game that'll make sure you know all the answers…er, questions…when it comes to circles.