A perpendicular.
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A line that is at 90 degrees to another line is called a perpendicular line. Perpendicular lines intersect at right angles (90 degrees) forming a "L" shape.
90 degrees north latitude is called the North Pole, and 0 degrees latitude is the Equator.
The largest possible latitudes are 90 degrees north (the north pole) and 90 degrees south (the south pole).The largest possible longitudes are 180 degrees east and 180 degrees west.Both of those longitudes are the same line ... the International Date Line,which runs down the middle of the Pacific ocean.
Another name for 90 degrees north latitude is the North Pole.
The largest latitude is +90 degrees (North Pole) and -90 degrees (South Pole). The largest longitude is +180 degrees (international date line) and -180 degrees (same meridian on the other side of the globe).
Latitudes range from zero to 90 degrees.The equator is the line of zero latitude.The north pole is 90 degrees north latitude.The south pole is 90 degrees south latitude.