Plane
Conditions that determine a plane:
- A straight line and a point not belonging to it
- Two crossing straight lines
- Three points not belonging to the same straight line
- Two parallel straight lines
Definition of parallelism
- Between two planes
There is no common point between the two planes. - Plane and straight line
There is no common point between the plane and the straight line. - Two straight lines
The two straight lines are on the same plane and share no common point.
Theorem of three perpendicular lines
[0]Top