The area of an obelisk is the sum of the areas of each of the
sides and the sum of the areas of each side of the pyramid shaped
top. Since the structure is regular in its proportions this is:
Area of 1 side = (1/2)Hside x (Wtop+Wbottom) = Aside
Area of 1 top face = (1/2)Htop x Wtop = Aface
Total area = (4 x Aside)+(4 x Aface)
Where A = area, H = height, W = width