Area Index

# Area of a Ring Formulas & Calculator

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

## Formula Knowing Both Radius

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

$$"area" = π(R^2-r^2)$$

Internal and External Radius

Area result

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### Where:

$$π = "constant number "$$
$$R = "external radius"$$
$$r = "internal radius"$$

## Ring Definition

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.

## Area Definition

It is the space of the internal surface in a figure, it is limited for the perimeter. Also, the area can be calculated in a plane of two dimensions.

## 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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