KA-0177
about 150sHow many diagonals does a convex polygon with 12 sides have? A diagonal joins two vertices that are not already joined by a side.
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Needs an idea, not just a procedure.
3 in a row to finish this ladder.
0/1 solvedHow many diagonals does a convex polygon with 12 sides have? A diagonal joins two vertices that are not already joined by a side.