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September 21, 2014

September 21, 2014

Posted by **ALISON** on Saturday, September 17, 2011 at 10:42pm.

- trig -
**Steve**, Wednesday, September 21, 2011 at 12:44pmThe wiper covers 60 deg, or 1/6 of a circle. The area of a circle is πr^2. So, the area of a 10" circle is 100π. But we have to subtract the area of a 1" circle, since the rubber does not cover the inside inch. That would be π. So, a whole 10" circle minus a 1" circle would be 99π. But we only have 1/6 of that, or 16.5π = 51.8 sq. in.

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