Formula Index
# Perimeter of a Right Triangle Formulas & Calculator

## Formula Knowing the three Sides

### Where:

## Formula Knowing the Two Sides that makes the 90º angle

### Where:

## Right Triangle Definition

## Perimeter Definition

## Formula Definition

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.

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

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

$$a = "length of the base side"$$

$$b = "lateral side"$$

$$c = "oposite sides"$$

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

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

$$a = "base side"$$

$$b = "lateral side"$$

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.

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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