金字塔截面探索
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这个GeoGebra范例展示了如何利用平面切割金字塔,生成并分析截面多边形的形状与性质。核心数学概念包括立体几何、平面与多面体的交线以及截面多边形的性质。作图要点提炼自构造摘要:使用Polygon、PointIn、Translate、Rotate、Pyramid、Plane、IntersectPath、OrthogonalLine等命令,并利用pyramid poly3、slicing plane、intersection points及各面边对象进行空间构建。适合高中几何、早期微积分或空间推理活动,帮助学生可视化三维图形与二维截面的关系。
GeoGebra 命令及参数
Polygon(B + (-2, -2), B + (2, -2), B + (2, 2), B + (-2, 2)) → poly3, e, f, g, iPointIn(poly3) → CTranslate((0, 0, 0), Vector[B, C]) → APolygon(A + (-4, -4), A + (4, -4), A + (4, 4), A + (-4, 4)) → poly1, a, b, c, dRotate(Rotate[Translate[poly1, Vector[A, A + (0, 0, h)]], (90° * s), A + (0, 0, h), yAxis], (90° * t), A, zAxis) → poly2Pyramid(Polygon[(-1.5, -1.25, 0), (1.5, -1.25, 0), (1.5, 1.25, 0), (-1.5, 1.25, 0)], (0, 0, 4)) → m, face1, face2, face3, face4, edge1, edge2, edge3, edge4Rotate(D, 120°, (0, 0, 0)) → EPolygon(D, E, 3, xOyPlane) → poly4, j, k, l, FPointIn(poly2) → GPointIn(poly2) → HPointIn(poly2) → IPlane(G, I, H) → nIntersectPath(n, m) → poly6, poly5, r, a_1, b_1, c_1, K, L_1, O, P, J, L, p, qRotate(m, 0, zAxis) → m'Rotate(m, 0, zAxis) → m'_1OrthogonalLine(A, n) → d_1