If the sides are of length 4 units then the perimeter is 8*4 = 32 units.
Its area is then 77.255 square units.
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Area in square units = 0.5*(apothem)*(perimeter)
Perimeter = 2*Area/Apothem.
130 to find the area of any regular polygon, multiply the perimeter by one-half the apothem. This is the same as multiplying the side-lengths by the number of sides by one-half the apothem.
an octagon doesn't have a volume its has and area ecause it is a 2-d figure. to find the area of a 2-d regular figure it is 1/2 apothem * perimeter (apothem is the distance of a line from the center of a polygon, to the midpoint of a side)
If the perimeter is 15, he apothem cannot be 18.1