Area of a triangle in square units = 0.5*base*height
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perimeter = 4 x sqrt 72 = 33.94 in area = 72 squinches
You cannot. The perimeter alone does not provide enough information unless the octagon is regular and there is no valid reason to assume that it is.
About 391.1 units2
Area of square: 324 square inches Perimeter of square: 72 inches
Area = 1/2 (base x height) If the triangle is sitting on the 9cm side, then 72 = 1/2 ( 9 x height ) Height = 16 cm There are an infinite number of ways to draw the remaining two sides such that the height of the triangle is 16 cm. So the given information doesn't define a unique perimeter.