28-04-2017
Mathematics

contestada

if a polygon has 189 diagonals how many sides does the polygon have ?

Respuesta :

Аноним Аноним

28-04-2017

n(n-3)/2=189
n(n-3)=378
n^2-3n-378=0
n=21

Answer Link

AtoticMan AtoticMan

28-04-2017

(n take 2) minus n = 189
n(n-3)/2 = 189
n(n-3) = 378
n^2-3n-378 = 0
n=21

Answer Link

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