The perimeter of a nonagram can be calculated using the following formula: if you know the length of a side.
If you know the length of one of the sides of the nonagram, you can calculate its perimeter using the following formula:
$$"perimeter" = S * 18$$
$$18 = "number of sides in a nonagram"$$
$$S = "side"$$
It is a geometric figure with 18 sides and 9 vertices, all the sides have equal length. Also a regular nonagram has all the same angles. All regular nonagram look the same.
An irregular nonagram can have vitually infinite posibles shapes, Despite this all have 18 sides and 9 vertices.
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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