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help plsss

 Jun 28, 2018
 #1
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Since the inscribed polygon is an octagon, then the top angle of the small right-angle triangle=

180/8 =22.50 degrees.

Cos(22.5) = 4.5 / radius

Radius =4.5/cos(22.5)

Radius =4.87

Area of circle =4.87^2 x pi

                         =~74.50

Area of the octagon=sin(22.5) x 4.5 x 4.87 x 8 =~67.10

Area of the shaded region =74.5 - 67.1 =7.4

 Jun 29, 2018

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