You can put this solution on YOUR website! An octagon has an area of 100”, it’s [sic] side length is 5, find it’s [sic] apothem.
----------------
I assume you mean 100 square inches.
Assuming it's a regular octagon, each central angle is 45 degs, and the area of each triangle formed by the radii is 1/8 of the 100 sq inches = 12.5 sq inches.
--------------
Area = 12.5 = b*h/2 = 5*h/2 (h is the apothem)
h = 5
That won't work.
--------------
Area of an octagon with sides of 5 is
Area =~ 120.71 sq inches
It can't be an octagon with sides = 5 and area = 100.
-----------------
PS it's = it is
