# 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 Points-Distance Formula
2. Problem 1: Showing Collinearity of Points-Distance Formula
3. Showing Triangle is Equilateral-Distance Formula
4. Problem 1: Showing Triangle is Equilateral-Distance Formula
5. Showing Triangle is Isosceles-Distance Formula
6. Problem 1: Showing Triangle is Isosceles-Distance Formula
7. Showing Triangle is Right Angle-Distance Formula
8. Problem 1: Showing Triangle is Right Angle-Distance Formula
9. Showing Triangle is Scalene-Distance Formula
10. Problem 1: Showing Triangle is Scalene-Distance Formula
11. Verifying Points Forming Square-Distance Formula
12. Problem 1: Verifying Points Forming Square-Distance Formula
13. Verifying Points Forming Rectangle-Distance Formula
14. Problem 1: Verifying Points Forming Rectangle-Distance Formula
15. Verifying Parallelogram-Distance Formula
16. Problem 1: Verifying Parallelogram-Distance Formula
9.3: Mid-Point Formula
1. Recognition of Mid-Point Formula for Two Points
2. Problem 1: Recognition of Mid-Point 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