# What is the intersection of two planes?

A plane in geometry is a flat surface that extends to infinity from all directions.

## Answer: The intersection of two planes is always a straight line.

Let us find the intersection of two planes.

**Explanation:**

Intersecting planes are planes that are not parallel, and they always intersect in a line.

The two planes cannot intersect at 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 is a real-life example of intersecting planes.