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The regular nonagon will consist of 9 congruent isosceles triangles with base angles of 70 degrees and an apex angle of 40 degrees.

Its 2 equal sides: square root of 385.6367484*2/sin(40)*9 = 11.6952176 cm

Its base: sin(40)*11.6952176/sin(70) = 8 cm

Perimeter: 9*8 = 72 cm

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Q: What is the perimeter of a regular nonagon that has an area of 395.6367484 square cm?
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