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Visual definition of Pi (3.14), diameter, radius, and other circle vocab, as well as visual aides in learning math formulas for circles.

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from Teachers Pay Teachers

### Pi - A Linear Equation Graphing Activity

Celebrate Pi Day with this linear equation graphing activity. Students are given a list of linear equations each with a corresponding domain or range. The equations will occur in either standard form or slope-intercept form. When the students graph all of the equations, they will have a picture of the symbol "Pi."

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from HubPages

### What is Pi. Includes formulas, equations, examples.

All about pi and Pi Day. Includes pi formulas and equations.

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Pi Formula Has Been Discovered Hidden Deep Inside Hydrogen Atoms

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from ABC News

### Why You'll Want to Circle This Year's Pi Day on Your Calendar

Pi Day: Circle Your Calendar -- Once-in-a-Century Day Coming This Weekend - ABC News

from Teachers Pay Teachers

### Pi Day Pennant

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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from Teachers Pay Teachers

### Pi Day Song: Pi With a Little Help From My Friends

This is a fun song to sing on Pi Day and will liven up any Pi Day Celbration. It is to the tune of the "With a Little Help From My Friends" Made famous by the Beatles-- It can also be used when studying volume and surface area formulas for cylinders and spheres.

Euler's identity seems baffling: $$e^{i\pi} = -1$$ It emerges from a more general formula: $$e^{ix} = \cos(x) + i \sin(x)$$ Yowza -- we're relating an _imaginary exponent_ to sine and cosine! And somehow plugging in pi gives -1? Could this ever be intuitive? Not according to 1800s mathematician Benjamin Peirce: > It is absolutely paradoxical; we cannot understand it, and

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