\begin{definition}[Definition:Composition of Ratio]
Let $R = a : b$ be a ratio.
Then the '''composition of $R$''' is the ratio $a + b : b$.
{{EuclidSaid}}
:''{{Definition:Euclid's Definitions - Book V/14 - Composition of Ratio}}
{{EuclidDefRefNocat|V|14|Composition of Ratio}}
Category:Definitions/Euclidean Algebra
\end{definition}