球体体积公式证明 by sjlg.sgs1
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①本范例通过动态演示和几何构造,直观展示球体体积公式的推导过程;②涉及核心数学概念包括球体、体积、相似变换、几何作图、正交线等;③构造过程中运用了Intersect(交点)、Point(点)、Circle(圆)、Distance(距离)、Sphere(球体)、Cylinder(圆柱)、OrthogonalLine(正交线)、Segment(线段)、IntersectPath(路径交点)、Surface(曲面)、Polygon(多边形)、If(条件)等GeoGebra命令和对象;④适合高中立体几何教学,帮助学生理解体积公式的几何意义和推导逻辑。
GeoGebra 命令及参数
Intersect(xAxis, yAxis) → APoint(xAxis) → BCircle(A, B) → cDistance(A, B) → rPoint(xAxis) → DCircle(D, r) → hSphere(A, r) → aCylinder(h, r) → b, d, eCylinder(h, (-r)) → f, g, iPoint(xAxis) → COrthogonalLine(C, xOyPlane) → jSegment(E, C) → kPoint(k) → GIntersectPath(l, a) → pIntersectPath(l, b) → qSurface((u * cos(θ)) + Distance[A, D], (u * sin(θ)), u, θ, 0, 6.283185307179586, u, (-r), r) → mIntersectPath(l, f) → sOrthogonalLine(D, l) → nSurface(x(H) + (u * cos(θ)), (u * sin(θ)), z(G), u, z(G), r, θ, 0, 6.283185307179586) → oSegment(A, B) → tIntersect(h, xAxis, 2) → JSegment(D, J) → a_1Segment(A, I) → b_1Segment(D, H) → c_1Intersect(u, p) → K, LSegment(I, L) → d_1Segment(A, L) → e_1Segment(H, N) → f_1Segment(C, G) → g_1Segment(A, L) → h_1Polygon(A, I, L) → poly1, l_1, a_2, i_1Segment(S, R) → j_1Polygon(S, R, D) → poly2, d_2, s_1, r_1Segment(D, S) → k_1If(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → vIf(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → wIf(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → m_1If(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → n_1If(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → o_1If(Step ≠ 10, Step ≟ Step + 1, Step ≟ 0) → p_1