The Pi Shawl formula, from #yarnschool by Over the Rainbow Yarn.

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In this collaborative activity celebrating Pi Day, students work with the circle formulas to find area, circumference, radius and diameter. Each pennant also includes a Fun Fact that students can read as they complete their circle problems. Once a pennant is complete, it can be hung along a string in your classroom to celebrate Pi Day!

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Every few weeks a new homespun smart mirror pops up on Reddit. The formula is pretty staid by now: put an LCD and a Raspberry Pi behind a one-way mirror, and now you have a weather widget to look...

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There's a Hidden Connection Between Pi and Quantum Mechanics

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Pi Day 2015: meet the man who invented π

Pi Formulas -- from Wolfram MathWorld - Mathematica

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Ramanujan’s Pi Formula The second video in a series about Ramanujan. Continuing the biography and a look at another of Ramanujan’s…