A polygon has 27 diognals . How many sides dose it have ????
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Hola..!
n(n-3)/2 = 27
n(n-3) = 54
n2 - 3n = 54
n2-9n+6n = 54
n(n-9)+6(n-9)=54
n = -6 or 9
excluding the negative
n = 9
hs4009747:
I don't understand where the 6n is come
can you explain me
I factorise this by a²-b² formula
ok thank
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