Q4) The dot product of the directional vectors of two planes = 0. Therefore, the angle between the two planes is: 0 0 or 360'" C) 45 or 135 0 perpendicular 0 cross product = U 06) "Turn the vector into ax + by + cv = d, and plug in the point to solve for d" is a useful to nd a plane, when... 0 a normal vector and a point is known 0 a directional vector and a point is known 0 the dot product of two vectors are known 0 the cross product of two vectors are known