# Math Tuesday: Proving the area of a circle with beads

## Visual proof shows how we know the formula for the area of a circle

May 29, 2012, 3:52 PM

Visual proof shows how we know the formula for the area of a circle

Teaser:

Ever wonder how you know that the area of a circle is Pi times the square of the radius? This video explains why.

Visual explainer video guy "minutephysics" delves into a bit of math this week, offering up an animated description of how to prove that the area of a circle is Pi times the square of the circle's radius. Check it out:

Now if I could just as easily remember the quadratic formula quickly, I'd be all set.

*Keith Shaw rounds up the best in geek video in his ITworld.tv blog. Follow Keith on Twitter at @shawkeith. For the latest IT news, analysis and how-tos, follow ITworld on Twitter, Facebook, and Google+.*

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