I suppose you mean "algebra". There are lots of formulas in algebra. Look up any introductory algebra school book.
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http://wiki.answers.com/Q/What_is_the_mathematical_formula_for_calculating_a_surface_area_for_a_building"
Temperature is usually measured, rather than calculated.
Yes and it is for any circle: circumference/diameter = pi
The mathematical formula for calculating the square root of a number is x_{n+1}=x_n-\frac{f(x_n)}{f'(x_n)}=x_n-\frac{x_n^2-S}{2x_n}=\frac{1}{2}\left(x_n+\frac{S}{x_n}\right).
Is the land flat? if so you'd simply multiply the area of land by the depth of sand.