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vector M=(x,y)
vector M perpendicular=(-y,x)
Aplicando esto tenemos:
vector A perpendicular=(-3,-8)
vector B=(-9,-2)
Producto Punto
(a,b).(m,n)=a.m+b.n
Reemplazando en la fórmula tenemos:
(-3,-8).(-9,-2)=27+18=45
Saludos.