SOLUTION: a polygon has 90 diagonals. how many sides does it have?
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Question 222148
:
a polygon has 90 diagonals. how many sides does it have?
Answer by
solver91311(12126)
(
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):
You can
put this solution on YOUR website!
There are
diagonals in a
-sided polygon. Set the formula equal to 90 and solve for
.
Hint: You will end up with a factorable quadratic. You will get two roots. Exclude the negative root because you cannot have a negative number of sides.
John
