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Introduction

Coordinate Geometry

Coordinate geometry is a plotting points, lines and curves on an x and y axis.

The coordinates of a point on the x-axis are of the form (x, 0) and that of the point on the y-axis are (0, y).

The plane is called the Cartesian, or coordinate plane and the lines are called the coordinate axes.

The horizontal line is called the x - axis and the vertical line is called the y - axis.

The coordinate axes divide the plane into four parts called quadrants.

The coordinates of a point are of the form (+ , +) in the first quadrant, (–, +) in the second quadrant,
(–, –) in the third quadrant and (+, –) in the fourth quadrant, where '+' denotes a
positive real number and '–' denotes a negative real number.

The distance of a point from the y-axis is called its x-coordinate or abscissa.

The distance of the point from the x-axis is called its y-coordinate or ordinate.

The point of intersection of the axes is called the origin. The coordinates of the origin are (0, 0).

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