# Straight lines Formulas for Class 11 Maths Chapter 10

## Straight lines Formulas for Class 11 Maths Chapter 10

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1. Slope (m) of the intersecting lines through the points (x1, y1) and x2, y2) is given by $$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}=\frac{y_{1}-y_{2}}{x_{1}-x_{2}}$$; where x1 ≠ x2
2. An acute angle θ between lines L1 and L2 with slopes m1 and m2 is given by $$tan\:\theta =\left | \frac{m_{2}-m_{1}}{1+m_{1}.m_{2}} \right |$$; 1 + m1.m2 ≠ 0.
3. Equation of the line passing through the points (x1, y1) and (x2, y2) is given by: $$y-y_{1}=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}(x-x_{1})$$
4. Equation of the line making a and b intercepts on the x- and y-axis respectively is: $$\frac{x}{a}+\frac{y}{b}=1$$
5. The perpendicular distance d of a line Ax + By + C = 0 from a point (x1, y1) is: $$d=\frac{\left | Ax_{1}+By_{1}+C \right |}{\sqrt{A^2+B^2}}$$
6. The distance between the two parallel lines Ax + By + C1 and Ax + By + C2 is given by: d=$$\frac{\left | C_{1}-C_{2} \right |}{\sqrt{A^2+B^2}}$$

#### Summary Straight lines Formulas

We have listed top important formulas for Straight lines for class 11 Chapter 10 which helps support to solve questions related to chapter Straight lines. I would like to say that after remembering the Straight line’s formulas you can start the questions and answers the solution of the Straight lines chapter. If you faced any problem to find a solution of Straight lines questions, please let me know through commenting or mail.

#### NCERT Solutions Class 11 Maths by Chapters

• Chapter 1 Sets
• Chapter 2 Relations and Functions
• Chapter 3 Trigonometric Functions
• Chapter 4 Principle of Mathematical Induction
• Chapter 5 Complex Numbers and Quadratic Equations
• Chapter 6 Linear Inequalities
• Chapter 7 Permutations and Combinations
• Chapter 8 Binomial Theorem
• Chapter 9 Sequences and Series
• Chapter 10 Straight lines
• Chapter 11 Conic Sections
• Chapter 12 Introduction to Three Dimensional Geometry
• Chapter 13 Limits and Derivatives
• Chapter 14 Mathematical Reasoning
• Chapter 15 Statistics
• Chapter 16 Probability