Angle Between Two Planes

Angle between two planes

The angle between two planes is defined as the angle between their normals.

The angle θ between the planes and is given by

cosθ =

The angle θ between the planes a₁x + b₁y + c₁z + d₁ = 0 and a₂x + b₂y + c₂z + d₂ = 0 is given by

cosθ =