The perimeter of a stadium can be calculated using the following formula: if you know the length of the radius and the lateral side length.
If you know the length of the radius and the lateral side, you can calculate its perimeter using the following formula:
$$"perimeter" = 2(pir + a)$$
$$pi = "constant number"$$
$$r = "circle radius"$$
$$a = "lateral side length"$$
A perimeter is defined by the outer path of a shape. The shape is always in 2 dimensions. The perimeter is the total length of the exterior path. Another way of looking at this is to think of it as the boundary length of a shape.
In the case of a circle, the perimeter is called a circumference.
Perimeter has a Greek origin, "peri" means "around", and "meter" means "measure". So perimeter means "measure around".
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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