Vectors Flashcards
1
Q
what is the dot product equation?
A
a . b = a1b1 + a2b2 + a3b3
2
Q
what is the angle between two lines equal to?
A
the angle between two lines is equal to the angle between their direction vectors
3
Q
what do perpendicular lines determine for their dot product?
A
since cos(90) = 0,
two vectors are perpendicular if, and only if, their dot product = 0
