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Perimeter of a Isosceles Triangle Formulas & Calculator

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.

Formula Knowing the Base and a 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:

Isosceles Triangle Perimeter

$$"perimeter" = B + 2s$$

Isosceles Triangle Length

Perimeter result

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Where:

$$B = "length of the base"$$
$$s = "side"$$
$$2 = "number of equal sides"$$

Isosceles Triangle Definition

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.

Perimeter Definition

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".

Formula Definition

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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