area between 3 circles Watch

drunknmunky
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#1
Report Thread starter 12 years ago
#1
radius of each circle is 3.5mm

need to find the red area and the length of the line around the 3 circles

please help im really stuck

http://i12.tinypic.com/2hp3dau.jpg
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generalebriety
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#2
Report 12 years ago
#2
You need to split the area and perimeter up into small, easy bits. I've attached two diagrams - I won't tell you exactly what to do, you should be able to figure it out for yourself. First file helps with perimeter, second with area. (Note that all triangles in the second one are equilateral, too.)
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