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2=1+∆
2=1+∆
∆=d1-2 cos α1-2
∆Y=d1-2 sin α1-2
.
α=arctg(Y2-Y1)/(X2-X1)
d1-2=(Y2-Y1)/sin α1-2 = (X2-X1)/cos α1-2
d1-2=√(Y2 Y1)2+(X2 X1)2
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