If the diameter is 10 feet, then the radius is 5 feet.
The area of a full circle is pi*r^2, so a full circle would have an area of 25pi.
The semicircle then would have an area of 25pi/2, or 12.5*pi = 39.27 square feet.
If each can of paint covers 32 square feet, then the first can isn't enough to cover the semicircle, but 2 cans of paint would cover 64 square feet, so that's enough paint to cover the semicircle.
So the answer is 2 cans of paint.
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| 08/14/2009, 8:30 PM | Help with square footage |
| 08/15/2009, 12:01 AM | Re: Help with square footage |