This document outlines a lesson plan for teaching students to apply geometric methods to solve a design problem related to minimizing the cost of road construction. The lesson uses Geometer's Sketchpad software to allow students to model different road construction routes and calculate costs. Students work in teams to come up with various solutions using prior knowledge of distance formulas and geometric representations. The technology enhances the lesson by providing precise measurements and visual representations to help students efficiently test different problem-solving methods. It also supports critical thinking by engaging students in interactive modeling and exploration of solutions.