Equations Using the Exterior Angle Theorem--Example 4

Topic

Equations

Description

This example demonstrates another application of the Exterior Angle Theorem in solving triangle-related equations. In this scenario, we have a triangle with one known interior angle of 35°, an unknown interior angle x, and a known exterior angle of 120°. The Exterior Angle Theorem states that an exterior angle of a triangle is equal to the sum of the two non-adjacent interior angles. Here, the equation is set up as 120° = 35° + x. To solve for x, we subtract 35° from both sides, resulting in x = 85°. This problem illustrates how the theorem can be used to find an unknown interior angle when given one interior angle and the exterior angle. The methodology for solving such equations involves identifying the known angles, setting up the equation based on the theorem, and then using basic algebraic operations to isolate the unknown variable. This process combines geometric understanding with algebraic skills, reinforcing the connection between these two mathematical domains. By working through this type of problem, students develop a deeper understanding of angle relationships in triangles and practice important problem-solving techniques. This example serves as a valuable exercise in applying geometric theorems to real-world scenarios, preparing students for more advanced topics in mathematics.

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