NCERT Solutions  Class 10th Maths Chapter 7 Coordinate Geometry Ex 7.2 Q6

## NCERT Solutions Class 10th Maths Chapter 7 Coordinate Geometry Ex 7.2 Q6

NCERT Solutions for Class 10th Maths Chapter 7 Coordinate Geometry Ex 7.2 Q6

coordinate geometry  NCERT Solutions for Class 10th Maths Chapter 7   Ex 7.2 Q6 RD sharma solutions for class 11: http://www.cbselabs.com/forums/rd-sharma-class-11-solutions.46/

NCERT Solutions for maths in Video https://www.youtube.com/user/cbsepapers/videos

### Formulas

#### 1. Distance

If A ( x1, y1) and B( x2, y2,), then distance d, from A to B =

#### 4. Equation of a line

y = mx + c

y – y1 = m(x – x1)

#### 5. Parallel lines

If two lines are parallel, then they have the same gradient.

#### 6. Perpendicular lines

If two lines are perpendicular, then the product of the gradients of the two lines is -1.

or: perpendicular gradient = -1/m       where m is the gradient of the line perpendicular to it.

#### 7. Area of triangle

The area of the triangle formed by the three points (x1, y1), (x2, y2), (x3, y3)

#### 8. Shoelace formula

• go anti-clockwise direction
• must go back to first coordinate

#### 9. Circle

The equation of a circle whose center is (h,k) and radius is a is given by the equation

(x – h)2 + (y – k)2 = 0

The equation of a circle whose centre is the origin and whose radius is a is given by the equation
x2 + y2 = a2

The general equation of a circle is

x2 + y2 + 2gx + 2fy + c = 0

where the centre is (-g,-f) and radius is

The equation of a circle whose one diameter is the line segment joining the points
(x1, y1), (x2, y2) is given by

(x – x1)(x – x2) + (y – y1)(y – y2) = 0