The area of a ring can be calculated using the following formula: if you know the internal and external radius.
If you know the the internal and external radius of a ring, you can calculate its area using the following formula:
$$"area" = π(R^2-r^2)$$
$$π = "constant number "$$
$$R = "external radius"$$
$$r = "internal radius"$$
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.
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.
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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