What is the intersection of two planes?
Answer: The intersection of two planes is always a straight line.
Let us find the intersection of two planes
Intersecting planes are the planes that are no parallel, and they always intersect in a line
The two planes cannot intersect in more than one line.
The above figure shows the two planes, P and Q intersect in a single line XY.
Therefore, the line XY is the common line between planes P and Q.
The two connecting walls, the binding edge of a book where all the papers(planes) meet are a real-life example of intersecting planes.