Question

what is the intersection of plane p and palne r

Answer 1

Plane R and plane P intersect at AB. 

Planes are when 3 points that are not on the same line can be used to describe a plane. Plane P is horizontal and Plane R is vertical and these 2 planes intersect at line AB. Intersecting is where these 2 planes meet, therefore line AB is common to both planes.

Answer 2

Plane R and plane P intersect at AB is the final answer