👉 Check complete chapter: Class 9 Maths Chapter 1 Full Solutions
📌 Exercise 1.1 Solutions
Class 9 Maths Chapter 1 Exercise 1.1 Solutions
Step-by-step explanation based on Ganita Manjari (CBSE)
Why Class 9 Maths Chapter 1 Exercise 1.1 is Important
This exercise builds the foundation of coordinate geometry. It teaches how to find distance from axes, identify coordinates, and apply concepts in real-life situations.
Q1 (i) Distance of Door
Given: D₁ = (8, 0), R₁ = (11.5, 0)
Solution:
- Distance from y-axis = x-coordinate = 8 units
- Distance from x-axis = y-coordinate = 0 units
8 units from y-axis, 0 units from x-axis
💡 Concept: Distance from axis depends on coordinates
⚠️ Mistake: Confusing x and y
Q1 (ii) Coordinates of D₁
- x = 8
- y = 0 (on x-axis)
💡 Points on x-axis → (x, 0)
Q1 (iii) Width of Door
Width = |11.5 − 8| = 3.5 units
🚪 Real-life: ≈ 3.5 feet (comfortable for normal entry)
Q1 (iv) Bathroom Door
Width = |4 − 1.5| = 2.5 units
Room door = 3.5 units
Bathroom door = 2.5 units
👉 Bathroom door is narrower
As per CBSE curriculum, strong fundamentals in coordinates are essential for higher classes. Visit CBSE Official Website
🧠 Chapter Summary
- Points on x-axis → y = 0
- Points on y-axis → x = 0
- Distance = difference of coordinates
❓ Frequently Asked Questions
Q1. How to find distance from x-axis?
Distance = y-coordinate of the point
Q2. What is coordinate form of a point?
A point is written as (x, y)
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📘 Download Class 9 Maths NCERT Book (Ganita Manjari 2026)
For better understanding of concepts, students should always refer to the original NCERT textbook. You can download the official Class 9 Maths book directly from the NCERT website.
This will help you practice questions exactly as per CBSE exam pattern and improve conceptual clarity.
📥 Download NCERT Class 9 Maths BookSource: Official NCERT Website