**Þ**

**Coordinate Geometry:**The branch of mathematics in which geometric problems are solved through algebra by using the coordinate system is known as coordinate geometry.

**Þ**

**Coordinate axes:**The position of a point in a plane is determined with reference to two fixed mutually perpendicular lines, called the coordinate axes.

**Þ**

**Coordinate System,**position of a point is described by ordered pair of two numbers.

**Þ**

**Ordered pair:**A pair of numbers a and b listed in a specific order with 'a' at the first place and 'b' at the second place is called an ordered pair (a, b). Note that (a, b) ¹ (b , a) and (

*x*,

*y*) = (

*y*,

*x*), if

*x*=

*y*.

Þ P(a,b) be any point in the plane. 'a' the first number denotes the distance of point from Y-axis and 'b' the second number denotes the distance of point from X-axis.

Þ The coordinates of origin are (0,0)

Þ Every point on the x-axis is at a distance o unit from the X-axis. So its ordinate is 0.

Þ Every point on the y-axis is at a distance of 0 unit from the Y-axis. So, its abscissa is 0.

Þ The coordinates of a point on the

*x*-axis are of the form (

*x*, 0) and that of a point on the

*y*-axis are (0,

*y*).

Þ A point in the first quadrant will be of the form (+, +). Similarly, a point in the second, third and fourth quadrants will be of the form (–, +), (–, –) and (+, –) respectively.

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IX Co -Ordinate geometry Test Paper-1

IX Co -Ordinate geometry Test Paper-2

IX Co -Ordinate geometry Test Paper-3

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Assignment- IX Co -Ordinate geometry -5

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