r Symbol (r)

The latin letter r is used in math as a variable. It appears in geometric equations as a variable to represent the radius of a circle.

Symbol Format Data
r Unicode
114
TeX
r
SVG

Usage

The circumference of a circle is given the constant τ (tau) multpilied by the radius of the circle, where τ = 2π.

The area of a circle is give by one-half multiplied by τ (tau) mutliplied by the radius of the circle squared.

The Latin Alphabet is a collection of 26 symbols that form the basis of the English language. The alphabet's symbols are used throughout mathematics to represent variables, constants, and coeffecients.

Related Symbols

The capital Latin letter R is used in mathematics to represent the set of real numbers. Usually, the letter is presented with a "double-struck" typeface when it is used to represent the set of real numbers.