\begin{definition}[Definition:Circle/Arc/Major]
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Let $a$ and $b$ be two points on the circumference of a circle.
The '''major arc''' joining $a$ and $b$ is the longer of the two arcs joining $a$ and $b$.
In the above diagram:
:the arc $ECBDF$ is the '''major arc''' defined by $E$ and $F$
:the arc $CEFDB$ is the '''major arc''' defined by $B$ and $C$.
and so on.
\end{definition}