Pi for a Square (TANTON Mathematics) @DrJamesTanton

Pi for a Square (TANTON Mathematics) @DrJamesTanton

Uploaded June 2010 | Updated September 2026, 3 weeks ago

Everyone talks about the value of pi for a circle, but what is the value of pi for a square, or a triangle, or a septagon? Do the formulas for circumference and area, which involve pi, still work? (They do!)

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Pi for a Square (TANTON Mathematics)