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Coordinate Geometry

Bihar Board · Class 9 · Mathematics

Quick revision notes for Coordinate Geometry — Bihar Board Class 9 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

30 questions23 flashcards4 concepts

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An illustration showing a grid of streets and houses, demonstrating how two pieces of information (street number and house number) are needed to precisely locate a specific house.
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Key Topics to Revise

1

Introduction to Coordinate System

  • To locate a point in a plane, we need two perpendicular reference lines
  • Real-life examples: Street addresses (street number + house number), seating arrangements (row + column)
  • The dot positioning activity shows that two independent pieces of information are needed to fix a point's position
2

Cartesian Coordinate System Components

  • Two perpendicular number lines form the coordinate system
  • Horizontal line is called x-axis (X'X), vertical line is called y-axis (Y'Y)
  • The intersection point of axes is called origin O with coordinates (0,0)
3

Coordinates and Their Properties

  • x-coordinate (abscissa): perpendicular distance from y-axis
  • y-coordinate (ordinate): perpendicular distance from x-axis
  • Coordinates are written as (x,y) - x first, then y
4

Signs of Coordinates in Different Quadrants

  • Quadrant I: (+,+) - both coordinates positive
  • Quadrant II: (-,+) - x negative, y positive
  • Quadrant III: (-,-) - both coordinates negative

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Full Notes

Key Concepts

A system that uses two perpendicularEvery point on the coordinate planeThe coordinate axes divide the planeThe origin O(0

Frequently Asked Questions

What are the important topics in Coordinate Geometry for Bihar Board Class 9 Mathematics?
Key topics in Coordinate Geometry include How to Correctly Identify the Quadrant of a Point, Coordinate Geometry — Complete Concept Map, Coordinate Geometry - Complete Chapter Overview. These are the concepts Bihar Board Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Coordinate Geometry — Bihar Board Class 9 Mathematics?
Understand the core concepts first, then work through the 30 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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