Sejam a with rightwards arrow on top, b with rightwards arrow on top e c with rightwards arrow on top três vetores quaisquer relacionados entre si,...

Sejam a with rightwards arrow on top, b with rightwards arrow on top e c with rightwards arrow on top três vetores quaisquer relacionados entre si, de forma que c with rightwards arrow on top equals space a with rightwards arrow on top space cross times space b with rightwards arrow on top, isto é, c with rightwards arrow on top é o produto vetorial entre a with rightwards arrow on tope b with rightwards arrow on top. Considerando apenas os casos em que open vertical bar c with rightwards arrow on top close vertical bar greater than 0, é correto dizer que A) a with rightwards arrow on top e b with rightwards arrow on top são sempre perpendiculares a c with rightwards arrow on top e nunca paralelos entre si. B) a with rightwards arrow on top é sempre perpendicular a c with rightwards arrow on top e nunca perpendicular a b with rightwards arrow on top. C) a with rightwards arrow on top e b with rightwards arrow on top são sempre paralelos a c with rightwards arrow on top e nunca perpendiculares entre si. D) a with rightwards arrow on top e b with rightwards arrow on top e c with rightwards arrow on top são sempre perpendiculares entre si. E) b with rightwards arrow on top é sempre perpendicular a a with rightwards arrow on top e nunca perpendicular a c with rightwards arrow on top.