Diagonals of a Rhombus by Neal Creeden

This example demonstrates the two diagonals of a rhombus and their property of being perpendicular bisectors of each other. Core mathematical concepts include the definition of a rhombus, diagonal properties, perpendicular bisectors, and angle relationships in plane geometry. Construction highlights: the GeoGebra commands Circle, Line, Intersect, Segment, and Angle are used to create vertices A, B, C, D and auxiliary points c, d, a, e, f, g, h, i, F, then construct circles, lines, intersection points, segments, and label angles α, β, γ, δ, ε, ζ, η, θ, ι, κ, λ, μ to verify the perpendicular bisector property. Suitable for middle‑school geometry instruction, high‑school plane geometry review, and geometric construction practice.