how many diagonals can be drawnin order to create all the triangles within a polygon

How may i find out how many diagoangles withnals can be drawn in order to create all the triiangles within a polygon . I know it has something to do with catalan numbers
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1 Answer

?????????????? "within" >>>>>>>>>>>>>>>

the werd is INSIDE INSIDE INSIDE INSIDE INSIDE

polygon diagonals...num diagonals=(num sides)-3
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