Class 9 Maths — Chapter 3: COORDINATE GEOMETRY

What you'll learn

• ▸The Need for a Coordinate System
• ▸The Cartesian System
• ▸Coordinates of a Point: Abscissa and Ordinate
• ▸Quadrants and Sign Conventions
• ▸Plotting Points in the Cartesian Plane
• ▸Coordinates of Points on the Axes

Chapter Summary

--- PAGE 1 --- CHAPTER 3 COORDINATE GEOMETRY 'What's the good of Mercator's North Poles and Equators, Tropics, Zones and Meridian Lines?' So the Bellman would cry; and crew would reply 'They are merely conventional signs!' LEWIS CARROLL, The Hunting of the Snark 3.1 Introduction You have already studied how to locate a point on a number line. You also know how to describe the position of a point on the line. There are many other situations, in which to find a point we are required to describe its position with reference to more than one line. For example, consider the following situations: I. In Fig. 3.1, there is a main road running in the East-West direction and streets with numbering from West to East. Also, on each street, house numbers are marked. To look for a friend's house here, is it enough to know only one reference point? For instance, if we only know that she lives on Street 2, wi…

Practice Questions from this Chapter

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1. Explain map coordinates simply. Get Solution →
2. Compare latitude with longitude. Get Solution →
3. Apply coordinates in daily life. Get Solution →
4. Who is credited with developing the system of describing the position of a point in a plane, also known as the Cartesian system? Get Solution →
5. What is the horizontal line in the Cartesian coordinate system called? Get Solution →
6. What is the vertical line in the Cartesian coordinate system called? Get Solution →
7. What is the name for the point where the x-axis and the y-axis intersect? Get Solution →
8. The coordinate axes divide the plane into four parts. What are these parts called? Get Solution →

Did you know?

• 💡 René Descartes invented coordinate geometry after watching a fly on his ceiling.
• 💡 Ancient Babylonians used a form of coordinate system for astronomy over 3000 years ago.
• 💡 GPS satellites use precise coordinate geometry to locate any spot on Earth.
• 💡 The famous Battleship game uses coordinates to locate and sink enemy ships.
• 💡 A point's position in space can also be described with three coordinates, not just two.

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