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1)
180(N-2)
180(12-2)
180(10)
1800
2)
N(N-3)/2
8(8-3)/2
8(5)/2
40/2
20
3)
180(N-2)
180(72-2)
180(70)
12600
12600÷72
175
4)
N(N-3)/2
16(16-3)/2
16(13)/2
208/2
104
5)
180(N-2)
180(15-2)
180(13)
2340
2340÷15
156
6)
N(N-3)/2
12(12-3)/2
12(9)/2
108/2
54
7)
N(N-3)/2=14
N²-3N=28
N²-3N-28=0
N -7
N +4
NO PUEDE SER NEGATIVO
N=7
8)
156N
180(N-2)=156N
180N-360=156N
24N=360
N=15
N(N-3)/2
15(15-3)/2
15(12)/2
15(6)
90