## 1. Slope or Gradient of a line :

2. Slope of a line terms of co – ordinates of any two points.

3. Slope of a line when its equation.

4. Angle between two lines.

(i). Condition for parallel :

(ii). Condition for perpendicular.

5. Equation & Length of tangent and Normal :

(i). Equation of tangent :

(ii). Equation of normal :

(iii). Length of tangent :

(iv). Length of Subtagent.

(v). Length of normal.

(vi). Length of Subnormal.

6. Some facts about the tangent.

7. Some facts about the normal.

8. Orthogonal Curves.

9. Point of inflexion.

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