Straight Lines | NCERT Series | Class 11th | Chapter 9 | SABRE ACADEMY | By Lt. AM Bhardwaj Sir

Straight Lines | NCERT Series | Chapter 9 | SABRE ACADEMY | By Lt. AM Bhardwaj Sir

Straight Lines is one of the most fundamental chapters of Coordinate Geometry. It deals with representing lines on a 2D plane using algebraic methods. In this topic, you learn how to determine the slope of a line, write various forms of line equations, and understand the geometric behavior of lines. Concepts like parallel & perpendicular lines, angle between two lines, and distance of a point from a line also form an important part of this chapter.

This chapter is highly important for board exams as well as competitive exams like JEE, NDA, SSC, PSC, State Exams, and more.
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🔍 Key Concepts Covered
Slope of a Line
Forms of Line Equations:
Slope–Intercept Form
Point–Slope Form
Two-Point Form
Intercept Form
Normal Form
Angle Between Two Lines
Conditions for Parallel & Perpendicular Lines
Distance of a Point from a Line
General Equation of a Line
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🎯 Why is this Chapter Important?
Builds a strong foundation for advanced mathematics
Connects geometry with algebra
Helps in graph interpretation and geometric reasoning
High-scoring and frequently asked in competitive exams
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