Day-51 | Ex-10.3 Straight Lines | Q13,14,15,16,17 | Class 11 | Ashu Sir

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📘 Day-51 | Ex-10.3 Straight Lines | Q13–17 | Class 11 | NCERT | Ashu Sir (MVVI)

In today’s Day-51 class, Ashu Sir explains Exercise 10.3 (Straight Lines) from Class 11 NCERT with a strong conceptual + exam-oriented approach.
This lecture covers Question 13 to 17, including the important concept of distance of a straight line from the origin, explained step by step for better understanding and problem-solving.

🔹 Topics Covered in This Video:
✔ Distance of a straight line from the origin
✔ Condition of intersection of two lines
✔ Angle between two straight lines
✔ Family of straight lines
✔ Pair of straight lines and related concepts

📌 Why Watch This Video?
✅ Clear explanation of distance from origin formula
✅ NCERT-based step-by-step solutions
✅ Easy tricks for board & JAC 2026 exams
✅ Perfect for Class 11 beginners


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📐 Distance from the Origin – Key Concept:

For a straight line

ax + by + c = 0

= \frac{|c|}{\sqrt{a^2 + b^2}}


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📊 Example Questions Discussed:

🔸 Find the distance of a given straight line from the origin
🔸 Show that the distance of two parallel lines from origin is same/different
🔸 Find the angle between two given lines
🔸 Solve NCERT Ex-10.3 Q13–17 in a simple and logical manner


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📚 Related Chapters:
🔹 Straight Lines (Class 11)
🔹 Coordinate Geometry

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