SOLUTION: Find the number of sides of a polygon if the sum of the number of sides and the number of diagonals is 66.
A. 11
B. 12
C. 14
D. 16
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Question 1153291: Find the number of sides of a polygon if the sum of the number of sides and the number of diagonals is 66.
A. 11
B. 12
C. 14
D. 16
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!
total number of diagonals: where is the number of
if the sum of the number of and the number of is , we have
...factor completely
solutions:
-> disregard negative solution
the number of sides is
answer: B.
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