Decimal Spider: A Playful Fusion of Decimals and Geometry

① This interactive GeoGebra example, named 'Decimal Spider', visualizes how decimal place values map onto a spider-web-like geometric pattern, making abstract decimal numbers tangible and dynamic. ② Core mathematical concepts include decimal representation, arithmetic mean, cosine functions, polynomial functions, and touches of incircle geometry and combinatorics, demonstrating interdisciplinary connections between number and shape. ③ Construction highlights: Based on the summary, the applet employs multiple text objects (text1 to text10) for labels and values, points A, B, C, D, C_1, D_1 to form the geometric framework, sliders (a, b) to control parameters, and polynomial/cosine functions to generate the evolving web pattern; an image (pic1) may serve as a visual backdrop. ④ Suitable for upper-elementary to middle-school students exploring decimals, and for teachers demonstrating numeric visualization and function graphing in an engaging, cross-curricular way.