Chapter 9: Introduction to Coordinate Geometry
9.1: Distance Formula 
1. Derivation of Distance formula 
2. Problem 1: Derivation of Distance formula 
3. Use of Distance formula 
4. Problem 1: Use of Distance formula 

9.2: Collinear Points 
1. Showing Collinearity of PointsDistance Formula 
2. Problem 1: Showing Collinearity of PointsDistance Formula 
3. Showing Triangle is EquilateralDistance Formula 
4. Problem 1: Showing Triangle is EquilateralDistance Formula 
5. Showing Triangle is IsoscelesDistance Formula 
6. Problem 1: Showing Triangle is IsoscelesDistance Formula 
7. Showing Triangle is Right AngleDistance Formula 
8. Problem 1: Showing Triangle is Right AngleDistance Formula 
9. Showing Triangle is ScaleneDistance Formula 
10. Problem 1: Showing Triangle is ScaleneDistance Formula 
11. Verifying Points Forming SquareDistance Formula 
12. Problem 1: Verifying Points Forming SquareDistance Formula 
13. Verifying Points Forming RectangleDistance Formula 
14. Problem 1: Verifying Points Forming RectangleDistance Formula 
15. Verifying ParallelogramDistance Formula 
16. Problem 1: Verifying ParallelogramDistance Formula 

9.3: MidPoint Formula 
1. Recognition of MidPoint Formula for Two Points 
2. Problem 1: Recognition of MidPoint Formula for Two Points 
3. Verification of Midpoint Formula 
4. Problem 1: Verification of Midpoint Formula 
5. Use of Midpoint Formula 
6. Problem 1: Use of Mid point Formula 
7. Problem 2: Use of Mid point Formula 
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