Given an example of a horizontal plane and a vertical plane from your environment.

Projectile on Horizontal Plane

Given three examples each of : intersecting lines parallel lines from your environment.

Example of Family of Planes

A body rolling on a horizontal plane is an example of

Given three examples of line segments from your environment.

A vertical tower stands on a horizontal plane and is surmounted by a vertical flag staff of height 6 meters. At point on the plane, the angle of elvation of the bottom and the top of the flag are respectively 30^@ and 60^@ . Find the height of tower

What is the name of horizontal and the vertical lines draw to determine the position of any point in the cartesian plane.