Three - Dimensional Geometry
• The angle between any two planes is same as the angle between their normals.
If the equations of two planes are known then the expression of the angle between the planes can be expressed in vector as well as in Cartesian form.
• Equation of lines in space can be uniquely determined in the following two conditions:
a) If the line in space passes through a given point and parallel to a given line.
b) If the line in space passes through two given poi