Answer:
10. If you are asked to give the intersection of any plane and any line not in that plane, your answer will always be be a point
11. If you are asked to give the intersection of two non-parallel planes, your answer will always be a line
12. If you are asked to give the intersection of two lines, your answer will always be a point
Explanation:
10. In space, a plane and a line that is not lying on this plane or parallel to it will always meet at point.
For instance, line PN intersects plane A at point N
11. The intersection of two planes in space is a line.
For instance, the intersection of planes QRST and PQRN is line RQ.
12. Two lines that are not parallel in the same plane will always intersect at a point.
For instance, lines TQ and PQ intersects at point Q
However, if two parallel lines are identical and coincide with each other, they intersect at infinitely many points.