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

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

(1/2)*b*2.5=2.59

b=2.072cm

Perimeter =2.072*8=16.576 cm