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(180°n-360°)/n
(180n-360)/n=140
180n-360=140n
40n=360
n=9
n=ilosć boków
(n-2)×180=140n
180n-360=140n
180n-140n=360
40n=360
n=360:40
n=9
wielokąt ma 9 boków.