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Perimeter of a Right Triangle Formulas & Calculator

The perimeter of a right triangle can be calculated using the following formula: if you know the length of the 2 sides that make the 90º angle.

Formula Knowing the three Sides

If you know the length of the three sides, you can calculate its perimeter using the following formula:

Right Triangle Perimeter

$$"perimeter" = a + b + c$$

Right Triangle Length

Perimeter result

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Where:

$$a = "length of the base side"$$
$$b = "lateral side"$$
$$c = "oposite sides"$$

Formula Knowing the Two Sides that makes the 90º angle

If you know the length of the two sides, you can calculate its perimeter using the following formula:

Right Triangle Perimeter

$$"perimeter" = a + b + sqrt(a^2 + b^2)$$

Right Triangle Length

Perimeter result

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Where:

$$a = "base side"$$
$$b = "lateral side"$$

Right Triangle Definition

It is a geometric figure with 3 sides and 3 vertices, the right triangle always have one 90º angle; also has 3 angles.

The right triangles will have always 3 sides and one right angle.

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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