The sign of x and y in 1st coordinate are (+, +), in 2nd coordinate are (–, +) in 3rd coordinate are (–, –) and in 4th coordinate are (+, –). Coordinate Geometry Formulas The following table gives some coordinate geometry formulas. STUDY MATERIAL FOR CBSE CLASS 9 MATH; Chapter 1 - Area of Parallelograms and Triangles; Chapter 2 - Circles; Chapter 3 - Constructions; Chapter 4 - Coordinate Geometry; Chapter 5 - Herons Formula; Chapter 6 - Introduction to Euclids Geometry; Chapter 7 - Linear Equations in two variables; Chapter 8 - Lines and Angles; Chapter 9 - Number Systems Coordinate Geometry also is known as analytic geometry that describes the link between geometry and algebra using graphs and involving curves and lines. Important Coordinate Geometry Formulas . Maths Formulas - Class XII | Class XI | Class X | Class IX | Class VIII | Class VII | Class VI | Class V Algebra | Set Theory | Trigonometry | Geometry | Vectors | Statistics | Mensurations | Probability | Calculus | Integration | Differentiation | Derivatives Hindi Grammar - Sangya | vachan | karak | Sandhi | kriya visheshan | Vachya | Varnmala | Upsarg | Vakya | Kaal | Samas | kriya | Sarvanam | Ling, Coordinate Geometry Formulas for Class 9 Maths Chapter 3, NCERT Solutions For Class 9 Maths by Chapters, Chapter 9 – Areas of Parallelograms and Triangles, List of Maths Formulas for Class 9th CBSE, List of Maths Formulas for Class 10th CBSE, NCERT Solutions for Class 7 Maths Chapter 1 Integers Introduction, List of Basic Maths Formulas for Class 5 to 12, Surface Areas and Volumes Formulas for Class 9 Maths Chapter 13, Areas of Parallelograms and Triangles Formulas for Class 9 Maths Chapter 9, Statistics Formulas for Class 11 Maths Chapter 15, Areas Related to Circles Formulas for Class 10 Maths Chapter 12, Circles Formulas for Class 9 Maths Chapter 10, Quadrilaterals Formulas for Class 9 Maths Chapter 8, List of Maths Formulas for Class 7th CBSE, Probability Formulas for Class 10 Maths Chapter 15, Coordinate Geometry Formulas for Class 10 Maths Chapter 7, Three Dimensional Geometry Formulas for Class 11 Maths Chapter 12, Three Dimensional Geometry Maths Formulas for Class 12 Chapter 11, Rational Number Formulas for Class 8 Maths Chapter 1, Comparing Quantities Formulas for Class 8 Maths Chapter 8, Algebraic Expressions and Identities Formulas for Class 8 Maths Chapter 9, \[ Equation\; of\; a \;line = ax + by + c = 0 \], \[ Equation\; of\; a \;circle = x^2 + y^2 = r^2 \], \[ Equation\; of \;a \;parabola = y^2 = 4ax \], \[ Equation\; of \;an\; ellipse = \frac{{x^2 }}{{a^2 }} + \frac{{y^2 }}{{b^2 }} = 1 \], \[ Equation\; of\; hyperbola = \frac{{x^2 }}{{a^2 }} – \frac{{y^2 }}{{b^2 }} = 1 \], \[ Distance\; formula\; D = \sqrt {\begin{bmatrix}{\left( {x_2 – x_1 } \right)^2 } +\\ {\left( {y_2 – y_1 } \right)^2 }\end{bmatrix}} \], \[ Angle \;between\; two\; lines\; \theta = \tan ^{ – 1} \left( {\frac{{m_2 – m_1 }}{{1 + m_1 m_2 }}} \right) \], Chapter 4 – Linear Equations in Two Variables, Chapter 5 – Introduction to Euclids Geometry. 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