Question 350718
An octagon has 8 sides.
If it's a regular octagon, each side = 42/8 = 5.25
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The area of ANY regular polygon with n sides of length s is:
{{{Area = ns^2*cot(180/n)/4]]]
{{{Area = 8*5.25^2*cot(22.5º)/4}}}
Area = 55.125*cot(22.5)
{{{Area = 55.215*(sqrt(2) + 1)}}}
=~ 133.08 sq units