How many diagonals does a polygon with 3 sides have?
Note
A diagonal joins two non-adjacent vertices. Use n(n − 3) ÷ 2; for 3 sides, that gives 0 diagonals.
How many diagonals does a polygon with 3 sides have?
A diagonal joins two non-adjacent vertices. Use n(n − 3) ÷ 2; for 3 sides, that gives 0 diagonals.