The area of a stadium can be calculated using the following formula: if you know the length of the radius and the length of straight side.
If you know the length of the radius and the straight side, you can calculate its area using the following formula:
$$"area" = (pi * r^2) + (2ra) $$
$$pi = "constant number"$$
$$r = "semicircle radius"$$
$$a = "length of the straight side"$$
It is the space of the internal surface in a figure, it is limited for the perimeter. Also, the area can be calculated in a plane of two dimensions.
It is a representation of a rule or a general principle using letters. (Algebra, A. Baldor)
When describing formulas in plural, it is also valid to say "formulae".
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