Math Example--Coordinate Geometry--Distance Formula: Example 9

Topic

Geometry

Description

This example demonstrates the application of the distance formula to find the distance between two points on a coordinate plane. The points (9, 6) and (5, -1.5) are plotted on a graph, and the distance between them is calculated using the formula: √((9 - 5)² + (6 - (-1.5))²) = √(4^2 + 7.5^2) = √72.25 = 8.5.

The distance formula is a fundamental tool in coordinate geometry, derived from the Pythagorean theorem. It enables students to calculate the length of a line segment given the coordinates of its endpoints. This collection of examples illustrates various scenarios where the distance formula can be applied, helping students understand its versatility and importance in solving geometric problems, including cases with decimal coordinates.

Presenting multiple worked-out examples is crucial for students to fully grasp the concept of the distance formula. By seeing the formula applied in different contexts, such as points with decimal coordinates as in this case, students can develop a deeper understanding of how to use it effectively. This approach also helps reinforce the steps involved in applying the formula, making it easier for students to solve similar problems independently.

Teacher Script: "Let's examine our ninth example of using the distance formula. We have two points on our coordinate plane: (9, 6) and (5, -1.5). Notice that one of our points has a decimal coordinate. As we work through this example, think about how this affects our calculation. Does having a decimal coordinate change our approach to using the distance formula? How does it impact our final result?"

For a complete collection of math examples related to Geometry click on this link: Math Examples: Distance Formula Collection.