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Revision Notes

Co-ordinate Geometry

ICSE · Class 9 · Mathematics

Quick revision notes for Co-ordinate Geometry — ICSE Class 9 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

37 questions28 flashcards5 concepts

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A diagram illustrating the basic concept of coordinate geometry, showing how a point's position is represented by a pair of numbers (coordinates) relative to two perpendicular number lines.
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Key Topics to Revise

1

1. Basic Ideas: Co-ordinates, Ordered Pairs, and Axes

  • A pair of two numbers is used to show the position of a point.
  • An ordered pair has a fixed order: (5,7) and (7,5) are different.
  • The first component is the abscissa and the second component is the ordinate.
2

2. Quadrants and Sign Convention

  • The axes divide the plane into four quadrants.
  • Quadrants are named from OX in the anti-clockwise direction.
  • First quadrant: both abscissa and ordinate are positive.
3

3. Points on the Axes

  • A point on the x-axis has ordinate zero, so its form is (x, 0).
  • A point on the y-axis has abscissa zero, so its form is (0, y).
  • The origin is the only point common to both axes.
4

4. Linear Equations, Dependence, and Graphs

  • If the graph of an equation is a straight line, the equation is called a linear equation.
  • In an equation written with y as the subject, y is the dependent variable and x is the independent variable.
  • In an equation written with x as the subject, x is the dependent variable and y is the independent variable.

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Full Notes

Key Concepts

An ordered pair is a pairA cartesian plane consists of twoThe axes divide the plane intoA point on the xTo plot a point

Frequently Asked Questions

What are the important topics in Co-ordinate Geometry for ICSE Class 9 Mathematics?
Co-ordinate Geometry covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Co-ordinate Geometry — ICSE Class 9 Mathematics?
Understand the core concepts first, then work through the 37 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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