Quick answer: Coordinate Geometry in Class 9 is short and easy — usually 3–4 marks — but it is the foundation of graphs, distance formulas and straight lines later on.
Terms
- x-axis (horizontal), y-axis (vertical), origin O(0, 0).
- A point is written (x, y): x = abscissa, y = ordinate. Order matters: (2, 3) ≠ (3, 2).
- Points on the x-axis have y = 0; on the y-axis x = 0.
Quadrant signs
| Quadrant | x | y | Example |
|---|---|---|---|
| I | + | + | (3, 2) |
| II | − | + | (−3, 2) |
| III | − | − | (−3, −2) |
| IV | + | − | (3, −2) |
Plotting
- Draw axes with equal scale.
- Move along x first, then up/down for y.
- Label the point.
Solved questions
1. In which quadrant does (−5, 4) lie? II. (0, −3)? On the y-axis (no quadrant).
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2. Plot A(1, 2), B(4, 2), C(4, 5), D(1, 5) and identify the figure: a square of side 3.
3. Mirror image of (3, −4) in the x-axis: (3, 4); in the y-axis: (−3, −4).
4. Distance of (0, 6) from the origin: 6 units (along the axis).
Common mistakes
- Swapping x and y
- Placing (0, 4) in a quadrant instead of on the y-axis
- Unequal scales on the two axes
Related: Lines and Angles Class 9.
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Frequently asked questions
Are these Coordinate Geometry Class 9 Notes notes enough for the exam?
They cover every formula, definition and question type that appears in school and board papers for this chapter. Use them with the NCERT examples, exercise questions and the last five years' papers to be fully prepared.
How should I revise Coordinate Geometry Class 9 Notes?
Revise the notes after 1 day, 7 days and 30 days. Solve five questions each time instead of only reading, and keep an error list of the steps you get wrong.
What if I get stuck on a coordinate geometry class 9 question?
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