Vertical Angle Measurement Practice (Problem 1)

This interactive GeoGebra applet allows students to assess their understanding of vertical angle measures. It demonstrates the relationship between the four angles formed by two intersecting straight lines, emphasizing that vertical angles are equal and adjacent angles are supplementary. The core mathematical concepts include angle measurement, vertical angle theorem, and linear pairs. The construction uses GeoGebra commands such as Line to create two intersecting lines, Intersect to find their common point O, Angle to label the four angles α, β, γ, and δ, and Textfield/InputBox to let students enter angle values and receive immediate feedback. This resource is suitable for middle school geometry lessons, serving as a practice tool for reinforcing the concept of vertical angles and angle calculations, and can be used for classroom exercises or self-assessment.