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Quadrant one (QI) is the top right fourth of the coordinate plane, where there are only positive coordinates. Quadrant two (QII) is the top left fourth of the coordinate plane. Quadrant three (QIII) is the bottom left fourth. Quadrant four (QIV) is the bottom right fourth.
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A quadrant in geometry is a two-dimensional space that is divided into four sections by two perpendicular lines, called axes. The quadrants are numbered from first to fourth, starting with the top right quadrant and going counter-clockwise. Each quadrant contains 90 degrees of space. The point where the two axes intersect is called the origin.
Quadrant - Math Open Reference. Most commonly used in mathematics to refer to the four quarters of the coordinate plane. Recall that the coordinate plane has an x-axis that divides into a top and bottom half, and a y-axis dividing into the left and right half. Together they create the four quadrants of the plane.
