Question

complete each postulate.
if two lines intersect, then exactly one contains both lines.
if any two points lie in a plane, then the joining them also lies in that plane.

Explanation:

• For the first statement, according to the plane - line intersection postulate, when two lines intersect, there is exactly one plane that can contain both lines.
• For the second statement, by the property of a plane, if two points lie in a plane, the line segment (or line) joining them lies in the same plane.

Answer:

1. plane
2. line