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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(180*(n-2))/n = 135 // - 135
(180*(n-2))/n-135 = 0
(180*(n-2))/n+(-135*n)/n = 0
180*(n-2)-135*n = 0
45*n-360 = 0
(45*n-360)/n = 0
(45*n-360)/n = 0 // * n
45*n-360 = 0
45*n-360 = 0 // + 360
45*n = 360 // : 45
n = 360/45
n = 8
n = 8
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