Question: (a) The area A of a regular octagon is given by the formula where r is the apothem, which is a line segment from the

(a) The area A of a regular octagon is given by the formula

where r is the apothem, which is a line segment from the center of the octagon perpendicular to a side. See the figure. Find the exact area of a regular octagon whose apothem is 12 inches.

(b) The area A of a regular octagon is also given by the formula

where a is the length of a side. Find the exact area of a regular octagon whose side is 9 centimeters.

=100 A 8r2 tan- =

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