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Area Of flat doughnut

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Post by PersianCat Sun Jul 06, 2008 1:46 pm

Find the area of this squashed doughnut.

Area Of flat doughnut 2008_010
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Post by SengWai Sat Jul 12, 2008 7:49 pm

are u reli that bored to find questions online just to post them XD

its not effective if u know the answer....we shud tackle it together!
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Post by PersianCat Sun Jul 13, 2008 6:52 pm

What, you want me to make up questions off the top of my head? Laughing

Btw, I don't know the answer.
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Post by PersianCat Mon Jul 14, 2008 11:28 pm

Area Of flat doughnut 2008_011

The trick here is that you dont need to find the individual areas of the circles.

Since from the triangle we have,

R2 = r2 + d2.


Then π R2 Area Of flat doughnut Symbol_minus π r2 = π d2 = 25π.

Smile
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