Question

Select the postulate about two planes.

Postulate 1: A line contains at least two points.
Postulate 1a: A plane contains at least three points not all on one line.
Postulate 1b: Space contains at least four points not all on one plane.
Postulate 2: Through any two different points, exactly one line exists.
Postulate 3: Through any three points that are not one line, exactly one plane exists.
Postulate 4: If two points lie in a plane, the line containing them lies in that plane.
Postulate 5: If two planes intersect, then their intersection is a line.

Answer 1

Postulate 5: If two planes intersect, then their intersection is a line.

Answer 2

Answer with explanation:

A surface is said to be plane, if line segment joining any two points on the surface completely lies on the surface.Then, that surface is said to be Plane.For example , Two dimensional xy Plane, Three Dimensional xyz plane.

The two postulate which is true about Planes

→Postulate 4: If two points lie in a plane, the line containing them lies in that plane.

→Postulate 5: If two planes intersect, then their intersection is a line.