Plane-Cut Lamina

This example demonstrates the geometric shape and cross-section formed by a plane cutting through a lamina. Core math concepts include function graphs, cross-sections, parabolas, planes, surfaces, incircles, isosceles triangles, step functions, spheres, and the Pythagorean theorem. Construction involves using the Surface command and objects a, z_1. Suitable for high school and above students to learn spatial geometry, calculus, and properties of polyhedral cross-sections.