What is the area of a regular 24 sided polygon that has a perimeter of 120 cm?

What is the area of a regular 24 sided polygon that has a perimeter of 120 cm?
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The polygon will consist of 24 congruent isosceles triangle eachhaving 2 equal angles of 82.5 degrees and 2 equal sides of19.15324394 cm with an apex angle of 15 degrees opposite the baseof 5 cm.Area of triangle: 0.5*19.15324394^2 *sin(15)*24 = 1139.363square cm to three decimal places
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