Net of a Cylinder by Norm Prokup

① This GeoGebra example dynamically demonstrates the unfolding of a cylinder's surface into a plane net, showing how the lateral surface becomes a rectangle and the top/bottom bases become circles. ② Core mathematical concepts include solid geometry of cylinders, nets, surface area calculation, and basic geometric elements such as circles, rectangles, and coordinate transformations. ③ Construction highlights: using GeoGebra commands like Line, Surface, Circle, Rotate, and CurveCartesian to build the cylinder and its unfolding process, involving objects such as height h, base radius g, rotation angle θ_max, a button (button1) to control animation, and auxiliary points (O, O_1, O_2) and curves (f, a, v, c, d, etc.) to achieve dynamic rotation and curve drawing. ④ Suitable for middle and high school geometry classes, this resource helps students understand the derivation of the cylinder's surface area formula and supports exploratory learning in mathematics labs.