Math Example--Area and Perimeter--Triangles: Example 26

Topic

Geometry

Description

This example combines the concept of perimeter calculation for an obtuse triangle with algebraic expressions. The triangle has sides labeled as x + 1, x + 2, and x + 4, with an obtuse angle of 120 degrees. Students are challenged to express the perimeter formula using these algebraic terms, applying their knowledge of both geometry and algebraic manipulation.

Integrating algebra into geometric problems involving obtuse triangles is a key skill in advanced mathematics. This collection of examples helps teach this topic by demonstrating how algebraic expressions can represent triangle dimensions in perimeter calculations. Students learn to manipulate these expressions, deepening their understanding of both algebra and geometry.

Exposure to multiple worked-out examples is vital for students to fully grasp the interplay between algebraic expressions and geometric concepts in various triangle types. Each example builds on previous knowledge, gradually increasing in complexity. This approach helps students develop problem-solving skills and recognize patterns in mathematical relationships involving variables.

Teacher Script: "Now we're looking at an obtuse triangle where each side is represented by an algebraic expression. How does this change our approach to finding the perimeter? Remember, we're still adding all the sides together, but now we need to simplify our expression. Can someone suggest how we might start this process and find the perimeter in terms of x?"

For a complete collection of math examples related to Area and Perimeter click on this link: Math Examples: Triangular Area and Perimeter Collection.