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any good geomerty people here?

Suggestion: make a cone out of a piece of paper..
unroll it

make note that the arc length is equal to the circumference of the base of the cone...

Think


Hmmmm... on second thought, it may be a little more complicated to realize than that...

Look at links for the surface area of a cone... see how it's derived (without calculus) - that may help.
 
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