An example of a line perpendicular to a plane is a straight pogo stick on the ground. This is because the pogo stick is at an angle of 90 degrees to the given plane (which is the ground). The line that creates the 90 degree angle is drawn in the green, and the plane is represented by the blue dashed box. Pogo sticks are often used as toys, exercise equipment, or extreme sports instrument. Many kids and adults enjoy using pogo sticks.
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