Geometry Construction Step 2: Perpendicular Lines and Intersections

① This example demonstrates a step-by-step geometric construction, showing how to draw lines, perpendiculars, intersections, segments, and angles to form a dynamic figure. ② The core mathematical concepts include perpendicularity, intersection properties, angle measurement, and dependency relationships among geometric objects. Although the original tags mention conditional probability, limits, boxplots, histograms, and optimization, the actual construction focuses on fundamental Euclidean geometry. ③ Construction details: Using GeoGebra commands such as Line, OrthogonalLine, Point, Intersect, Segment, and Angle, the objects A, B, a, b, c, C, d, D, e, f, g, h, α, β, γ, δ, and text1 are created to build the figure progressively and label angles. ④ Suitable for middle or high school geometry lessons, this example helps students understand perpendicular line construction, intersection determination, and angle labeling, and can serve as an introductory dynamic geometry exploration.