<PRE><B>Question 615825</B>
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Step 1:  Learn to spell octagon.


Step 2:  Go find the correct measurements of your octagon.  A regular octagon with an apothem of 6 units has a side length of approximately 4.83 units.  An octagon with an apothem of 6 units and one of the sides that measures 5 units is not regular.


Once you know the correct values use *[tex \LARGE A\ =\ S^2\ -\ a^2] where *[tex \LARGE S] is the span of the octagon which is twice the apothem, and *[tex \LARGE a] is the measure of one side.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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