The perimeter of a isosceles triangle can be calculated using the following formula: if you know the length of the base and the length of one side.
If you know the length of one of the sides and the base of the isosceles triangle, you can calculate its perimeter using the following formula:
$$"perimeter" = B + 2s$$
$$B = "length of the base"$$
$$s = "side"$$
$$2 = "number of equal sides"$$
It is a geometric figure with 3 sides and 3 vertices, the isosceles triangle has 2 equal sides and a base; also has 3 angles 2 of them are equal.
The isosceles triangles all look the same.
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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