A rule or fact written with mathematical symbols. A formula is a fact or rule that uses mathematical symbols. It will usually have.
A group of math symbols that expresses the relationship between the circumference of a circle and its diameter is an example of a formula.
In this section we will formally define relations and functions. For example we are making a cake then the recipe sometimes says to mix flour to water in the ratio 2 part 1. The formula for the area of a circle is an example of a polynomial function. Forall xepsilon mathbb R f x.