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(n-3)n=180
n²-3n-180=0
Δ=9-4*(-180(
Δ=9+720
Δ=729
√Δ=27
n₁=3-27/2=-24/2=-12 - nie spełnia
n₂=3+27/2=30/2=15
odp.wielokąt ma 15 boków
;P