It depends on what information you have. In the simplest case, if you know the length of a sides of a square is x units, then the are is x*x = x2 square-units
Formula for calculating the area of sphere is : 4 * pi * r * r
The answer will depend on what information you have.
area of dish end
You need to use an integral. And the formula for an integral will vary depending on the shape of your non square area.
The formula for calculating the area of a circle in terms of the radius is A r2, where A represents the area and r is the radius of the circle, expressed in square units.
The formula for the surface area of a circle is pi times the square of the radius. The formula for the surface area of a triangle is base times height, divided by 2. The formula for the surface area of a square or rectangle is length times width.
The formula for calculating the electric flux () through a closed surface is EdA, where E is the electric field and dA is a differential area element on the surface.
The formula for calculating the surface area of a prism is SA 2B Ph, where B is the area of the base, P is the perimeter of the base, and h is the height of the prism. The angle of the prism does not directly affect the surface area calculation.
Area of a circle measured in square units = pi*radius2
http://wiki.answers.com/Q/What_is_the_mathematical_formula_for_calculating_a_surface_area_for_a_building"
(2/3)*base*height
calculating surface area