矩形绕y轴旋转生成的三维图形
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①本范例演示将矩形绕y轴旋转后生成的三维图形;②涉及的核心数学概念包括立体几何、旋转体、解析几何;③作图要点——从下方『构造摘要』提炼用到了OrthogonalLine(正交线)、Point(点)、Intersect(交点)、Polygon(多边形)、Segment(线段)、Cylinder(圆柱)、Rotate(旋转)等GeoGebra命令/对象;④适合高中及以上学生学习和探索空间几何与旋转体的形成过程。
GeoGebra 命令及参数
OrthogonalLine(A, xAxis) → aOrthogonalLine(A, a) → bPoint(b) → BPoint(a) → COrthogonalLine(C, a) → cOrthogonalLine(B, b) → dIntersect(c, d) → DPolygon(A, C, D, B) → poly1, a_1, c_1, d_1, b_1Intersect(a, xAxis) → EIntersect(d, xAxis) → FSegment(A, E) → eCylinder(E, F, e) → f, g, h, iCylinder(E, F, e + a_1) → j, k, p, lSegment(D, F) → mSegment(C, E) → nRotate(D, r, xAxis) → D'Rotate(B, r, xAxis) → B'Segment(D', B') → qRotate(B, r, xAxis) → B'_1Rotate(A, r, xAxis) → A'Segment(B'_1, A') → sRotate(C, r, xAxis) → C'Rotate(D, r, xAxis) → D'_1Segment(C', D'_1) → tRotate(A, r, xAxis) → A'_1Rotate(C, r, xAxis) → C'_1Segment(A'_1, C'_1) → e_1Rotate(B, (-r), xAxis) → B'_2