Missing Complementary Angle

This GeoGebra example demonstrates how to find the missing complementary angle in a geometric figure, where complementary angles sum to 90 degrees. The core mathematical concepts include the definition of complementary angles, angle calculation, geometric construction techniques, and properties of polygons that may be involved. In terms of construction, the example uses various GeoGebra commands such as Line, Point, OrthogonalLine, Segment, Rotate, Angle, Ray, Polygon, Vector, and Translate, to create points like A, B, C, angles α, β, γ, and transformed points like F', G', etc., thereby building a complete figure to illustrate angle relationships. This example is suitable for middle school or high school students to practice and understand the concept of complementary angles, enhancing their geometric construction skills.