4. What is the least possible radius of a circle through two points A and B?

4. What is the least possible radius of a circle through two points A
and B?
In this video, we solve Exercise 5.1 – Question 4 from Chapter “I’m Up and Down, and Round and Round” from the new NCERT Class 9 textbook – Ganita Manjari.

✏️ Problem:
What is the least possible radius of a circle through two points A and B?

🔹 Topics Covered:

Circles and geometry
Radius and diameter concepts
Minimum radius of a circle
Relation between chord and centre
Geometrical reasoning and visualization

🧠 In this video, you will learn:
✅ Why the smallest circle occurs when AB becomes the diameter
✅ How the centre lies on the perpendicular bisector of AB
✅ Step-by-step geometric explanation
✅ Easy method for Class 9 students
✅ Exam-oriented explanation

📌 Chapter: I’m Up and Down, and Round and Round
📌 Exercise: 5.1
📌 Question Number: 4
📌 Subject: Mathematics
📌 Class: 9
📌 Textbook: Ganita Manjari (New NCERT)

🎯 Perfect for:

CBSE Class 9 students
NCERT learners
Geometry beginners
Exam preparation and homework help

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Видео 4. What is the least possible radius of a circle through two points A and B? канала Math Magic