The perimeter of a equilateral triangle 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 equilateral triangle, you can calculate its perimeter using the following formula:
$$"perimeter" = S * 3$$
$$3 = "number of sides in a triangle"$$
$$S = "side"$$
It is a geometric figure with 3 points and 3 sides. All the sides are equal. Also an equilateral triangle it has 3 angles. All equilateral triangle have the same side length.
All equilateral triangles have equal sides and also equal angles. Therefore is called equilateral.
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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