You use the same letter only once when naming a polygon (or parts of a polygon) to avoid ambiguity. If you have two line segments both labelled A, then you won't know which one you mean when you talk about segment A, right?
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Each letter in polygon should only be used once to avoid confusion. Triangle CCC would not make sense. Angle LWL could be opposite from angle LWL in rectangle LWLW.
Because if you gave more than one side the same letter - it would get confusing !
Why do you think each letter in a polygon's name can be used only once? ____________________________________________________ ______________/\ _____________/-- \ ____________/ -----\ ___________/______\ Its called triangle :)
To avoid confusion as to which vertex or side you are talking about.
A polygon can be used infinitely many times!