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Question: What is Quadrant ?

Answer:

A Circle can be cut into four equal sectors by two diameters at right angles. Each of these quarters of the circle is called a quadrant.

Each of the four regions into which the x-axis and y-axis divide the plane is also called a quadrant. A quarter of a plane, bounded by two lines at right angles to one another.

For example, in Cartesian co-ordinates the part of the plane with both x and y positive is a quadrant.