- AII
- BIII
- CI
- DIV
Step-by-Step Solution
In quadrant II the abscissa m is negative and the ordinate n is positive, so −n is negative. A negative abscissa together with a negative ordinate is quadrant III.
Answer: B) III
The point (m, n) lies in quadrant II. In which quadrant does the point (m, −n) lie?
Class 9Coordinate GeometryCoordinate Geometry
Key idea: Special points
- **Origin**: (0, 0).
- **On -axis**: , so the form is (a, 0). Examples: (3, 0), (−5, 0).
- **On -axis**: , so the form is (0, b). Examples: (0, 7), (0, −2).
- **First-quadrant point**: both positive.
- **Third-quadrant point**: both negative.
Knowing which axis or quadrant a point belongs to is a quick check that you've plotted it correctly.
- **On -axis**: , so the form is (a, 0). Examples: (3, 0), (−5, 0).
- **On -axis**: , so the form is (0, b). Examples: (0, 7), (0, −2).
- **First-quadrant point**: both positive.
- **Third-quadrant point**: both negative.
Knowing which axis or quadrant a point belongs to is a quick check that you've plotted it correctly.
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Coordinate Geometry practice questions
More Class 9 Coordinate Geometry practice
A rectangle has its sides parallel to the axes, with P(0, 0) and R(6, 4) as opposite…To find the area of the rectangle with corners (0, 0), (5, 0), (5, 3) and (0, 3), Sunil…A graph shows a plant's height in cm on the vertical axis against the week number on the…A student plots the five points (−2, 5), (3, 4), (−1, −6), (0, 7) and (5, −5). How many…Three of these four points lie in the same quadrant. Which one is the odd one out?