Formula Index
# Perimeter of a Ring Formulas & Calculator

## Formula Knowing Both Radius

### Where:

## FÃ³rmula Knowing the External Radio

### Where:

## Ring Definition

## Perimeter Definition

## Formula Definition

The perimeter of a ring can be calculated using the following formula: if you know the length of internal radius and external radius.

If you know the radius of the internal and external circumference of a ring, you can calculate its perimeter using the following formula:

$$"perimeter" = 2Ï€(R+r)$$

$$Ï€ = "constant number "$$

$$R = "external radius"$$

$$r = "internal radius"$$

If you know the external radius and the perimeter (circumference) of a ring, you can calculate its internal radius using the following formula

$$r = ("perÃmetro" / (2Ï€)) - R$$

$$Ï€ = "constant number "$$

$$R = "external radius"$$

$$r = "internal radius"$$

A ring is a shape or figure that is plane (2 dimensions) and perfectly round, with all points in the edge equidistant from the center.

The ring is has 2 radius also has 2 circumferences.

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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