Chapter 3 · Class 9 CBSE · Formula Sheet

Coordinate Geometry Formulas — Class 9 CBSE

Plot points on the Cartesian plane and understand abscissa, ordinate, and quadrants.

Key Formulas

Cartesian Plane

P(x, y) \text{ where } x = \text{abscissa}, y = \text{ordinate}

Origin

O(0, 0)

Quadrant I

(+, +)

Quadrant II

(-, +)

Quadrant III

(-, -)

Quadrant IV

(+, -)

Worked Examples

1Using: Supplementary Angles

If one angle is 65 degrees, find its supplement.

Step 1: Supplement = 180 - 65

Step 2: = 115 degrees.

Answer: 115 degrees

2Using: Vertically Opposite

Two lines intersect. If one angle is 40 degrees, find the vertically opposite angle.

Step 1: Vertically opposite angles are equal.

Step 2: The angle = 40 degrees.

Answer: 40 degrees

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More Class 9 CBSE Formulas

Number SystemsPolynomialsLinear Equations in Two VariablesIntroduction to Euclid's GeometryLines & AnglesTriangles

Frequently Asked Questions

How many formulas are in Class 9 CBSE Coordinate Geometry?+
There are 6 formulas in the Coordinate Geometry chapter for Class 9 CBSE. Each formula is essential for solving problems in this topic.
How to remember Coordinate Geometry formulas easily?+
Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.
Are these Coordinate Geometry formulas enough for exams?+
Yes, these formulas cover the complete CBSE Class 9 syllabus for Coordinate Geometry. Practice applying them to different types of questions for full exam readiness.

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