# help with story problem please

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• Nov 20th 2006, 08:49 AM
fancyface
help with story problem please
The epxression pie2 gives the area of a circle with the radius r. How many square meters of wheat were destryoed when an alian ship made a crop circle of diameter 25 meters in the wheat field at the southwind Ranch? find pie on the calculater?
• Nov 20th 2006, 10:19 AM
topsquark
Quote:

Originally Posted by fancyface
The epxression pie2 gives the area of a circle with the radius r. How many square meters of wheat were destryoed when an alian ship made a crop circle of diameter 25 meters in the wheat field at the southwind Ranch? find pie on the calculater?

By the way, it's "pi" not "pie."

If the diameter d = 25 m, then the radius is $\displaystyle r = \frac{d}{2} = \frac{25 \, m}{2} = 12.5 \, m$. So the area of the circle is:
$\displaystyle A = \pi r^2 = \pi (12.5 \, m)^2 = 490.874 \, m^2$.

You will find "pi" on your calculator by looking for the symbol "$\displaystyle \pi$".

-Dan