Question

If two planes intersect, then they intersect in exactly _____ line(s).

Answer 1

Answer:

they intersect exactly one line , if two planes intersect.

Step-by-step explanation:

We need to find the correct option to complete the given statement

"If two planes intersect, then they intersect in exactly _____ line(s)."

Since, a plane is determined by 3 non-co-linear points. In this case the three points are a point from each line and the point of intersection.

Hence, they intersect exactly one line , if two planes intersect.

Answer 2

That would be one line.