正方形底金字塔的截面 by nandrews
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①本范例演示正方形底金字塔在不同平面下的截面形状变化;②涉及的核心数学概念包括立体几何、截面几何、向量3D、微积分;③作图要点提炼自构造摘要,使用了Intersect(相交)、Point(点)、Polygon(多边形)、Pyramid(金字塔)、Line(线)、OrthogonalLine(垂线)、OrthogonalPlane(垂直平面)、IntersectPath(路径相交)、Plane(平面)、Segment(线段)等GeoGebra命令/对象;④适合高中及以上学段学习立体几何、微积分及三维向量知识的学生,可用于理解截面几何与空间想象能力。
GeoGebra 命令及参数
Intersect(xAxis, yAxis) → APoint(xAxis) → BPolygon(A, B, 4) → poly1, a, b, c, d, C, DPyramid(poly1, 6) → e, E, faceABE, faceBCE, faceCDE, faceADE, edgeAE, edgeBE, edgeCE, edgeDEPoint(edgeBE) → FLine(F, b) → fIntersect(f, edgeCE) → GOrthogonalLine(F, a, space) → gOrthogonalLine(G, c, space) → hIntersect(a, g) → HIntersect(c, h) → IPoint(edgeBE) → JOrthogonalPlane(J, edgeBE) → kIntersectPath(k, e) → poly3, K, q, L, M, N, O, l, m, n, pPoint(edgeCE) → PLine(P, b) → iIntersect(i, edgeBE) → QLine(P, c) → rIntersect(edgeDE, r) → RPlane(Q, P, R) → sIntersectPath(s, e) → poly2, S, T, U, V, t, a_1, b_1, c_1OrthogonalLine(F, poly1) → d_1Intersect(edgeBE, b) → WIntersect(edgeDE, c) → ZSegment(W, Z) → e_1Intersect(e_1, d_1) → A_1OrthogonalLine(F, e_1, space) → f_1OrthogonalPlane(F, e_1) → vIntersectPath(v, e) → poly4, B_1, C_1, D_1, g_1, h_1, i_1Point(edgeBE) → E_1Line(E_1, b) → j_1Intersect(edgeCE, j_1) → F_1OrthogonalLine(F_1, poly1) → k_1Point(k_1) → G_1Plane(E_1, F_1, G_1) → wIntersectPath(w, e) → poly5, H_1, I_1, J_1, K_1, l_1, m_1, n_1, p_1