Plane Intersection Postulate
Postulate: If two planes intersect, then their intersection is a line.
Use the 
and 
tools to add a second plane to the applet below.
Then use the the 
tool to show the intersection of these two planes.
Now use the 
tool (click and hold) to rotate the planes and see that the intersection is ALWAYS a plane.
and tools to add a second plane to the applet below.
Then use the the tool to show the intersection of these two planes.
Now use the tool (click and hold) to rotate the planes and see that the intersection is ALWAYS a plane.Identify two real world objects that model this postulate.