Question 867568
What is the area and perimeter of an octagon with a radius of 11?
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It's 8 isoceles triangles with 2 sides = 11 and a central angle of 45 degs
--> 16 right triangles
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{{{Area = nR^2*sin(360/n)/2}}}
= {{{8*121*sin(45)/2}}}
= 242*sqrt(2) sq units
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