This is an image of a sailboat that represents a line, drawn in red, perpendicular to a plane, drawn in yellow. The mast of the boat is hitting the floor of the ship at a 90° angle creating two adjacent right angles on either side of the mass. Sailboats are used for travel, racing, and leisure. Sailors use sailboats, but so do many vacationers and adventure seekers.
I discovered this image online at http://intermath.coe.uga.edu/dictnary/everyday.asp?termid=193
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