Plane-Line Postulate
Postulate: If two points lie in a plane, then the line containing them lies in that same plane.
- Use the
tool to locate two points in the plane given in the Applet below. - Then use the
tool to draw the line that contains the two points. - Now use the
tool (click and hold) to rotate the plane around to see that the line is in the same plane as the points (not above nor below).
In the second applet below, use the tool to plot two points that are NOT in the given plane.
Then use the tool to draw the line that contains these two points.
Now use the tool (click and hold) to see that your line is either above or below the plane.
Finally use the and the 
tool to create the plane that contains the line you made from the previous steps.
tool to plot two points that are NOT in the given plane.
Then use the tool to draw the line that contains these two points.
Now use the tool (click and hold) to see that your line is either above or below the plane.
Finally use the and the tool to create the plane that contains the line you made from the previous steps.