Question

What does it mean for two planes to be parallel?

Answer 1

Plane $\mathbf{-}\mathbf{3}\mathit{D}$ geometry:

Two planes are parallel means

1. Planes are three-dimension spaces. Two planes are parallel to each other.
2. Since the planes are parallel to each other, so they never intersect to each other.
3. The normal unit vectors of both planes are equal.
4. Distance between two parallel planes remains constant.

Hence, meaning of two parallel planes is explained.