Practice: Color Mixtures - Proportional Mixing with Geometry

① This GeoGebra example demonstrates color mixing through proportional combinations, using visual geometric elements to show how different base colors blend into new shades. ② Core math concepts include arithmetic ratios, combinatorial counting of mixtures, and geometric representations such as cuboids or conic sections to model the mixing space. ③ Construction: The summary lists objects A, B, and pic1, suggesting interactive points or sliders control color components, with geometric shapes providing a visual framework; no explicit commands are detailed, implying a drag-and-drop or slider-based interface. ④ Suitable for upper elementary to middle school students, ideal for hands-on math practice or cross-disciplinary art-math lessons, reinforcing proportional reasoning and systematic combination skills.