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What is the Perimeter of a octogon, if its area is 20.72Cm and its apothem is 2.5Cm

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area =20.72 cm^2
there are 8 triangles
area of one triangle = 20.72/8=2.59
Apothem = height of one triangle=2.5cm
Perimeter =2.072*8=16.576 cm