Question 1039434
What is the area of a regular 11-gon with a side of 6mm and an apothem of 10.2 mm? Round to the nearest whole number
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{{{Area = ns^2*cot(180/n)/4}}} where n = 11 & s = side length
=~ {{{11*36*3.406/4}}}
=~ 337 sq mms
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You can use side length or apothem.  You don't need both.