# Geometry Formulas For Class 11

The below table provides all the important geometry formulas that is included in class 11 Syllabus. The formulas in the table ate  are frequently used in class 11 geometry to calculate areas, lengths and volumes. It is essential that the student be able to automatically apply the very basic formulas of elementary Analytic Geometry:

 Coordinate Geometry & Lines Formulas for Class 11 Distance Formula $\left | P_{1}P_{2} \right |=\sqrt{\left ( x_{2}-x_{1} \right )^{2}+\left ( y_{2}-y_{1} \right )^{2}}$ Slope $m=\frac{rise}{run}=\frac{\Delta y}{\Delta x}=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$ Point-Slope Form $y-y_{1}=m\left ( x-x_{1} \right )$ Point-Point Form $y-y_{1}=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}\left ( x-x_{1} \right )$ Slope-Intercept Form $y=mx+b$ Intercept-Intercept Form $\frac{x}{a}+\frac{y}{b}=1$ General Form $Ax+By+C=0$ Parallel & Perpendicular Lines $Parallel \; m_{1}=m_{2}$ $Perpendicular \; m_{1}m_{2}=-1$ Distance from a Point to a Line $d=\frac{\left | Ax_{0}+By_{0}+C \right |}{\sqrt{A^{2}+B^{2}}}$

#### Practise This Question

The equation of the circle which passes through the points (2, 3) and (4, 5) and the centre lies on the straight line y - 4x + 3 = 0, is