椭圆滚动
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①本范例演示椭圆在直线上滚动时,其上一点的轨迹;②涉及核心数学概念包括椭圆、周长、全等、条形图、箱线图、组合数学;③作图要点:使用了Point, Segment, Midpoint, OrthogonalLine, Circle, Center, Intersect, Ellipse, Arc, Tangent, Angle, Rotate, Ray, Mirror等GeoGebra命令和对象;④适合高中阶段学习解析几何和几何变换的学生使用。
GeoGebra 命令及参数
Point(Circle[A, (2 * a)]) → BSegment(A, B) → cMidpoint(A, B) → COrthogonalLine(C, c) → dCircle(C, b) → eCenter(e) → DIntersect(e, d) → E, FCircle(F, Segment[A, C]) → fIntersect(f, c) → G, HEllipse(G, H, F) → gPoint(g) → IArc(g, A, I) → arcPoint(Circle[J, Circumference[g]]) → KSegment(J, K) → hCircle(J, arc) → kIntersect(k, h, 1) → LSegment(J, L) → iSegment(G, I) → jTangent(I, g) → l,Point(l) → MAngle(G, I, M) → αRotate(J, (-α), L) → J'Angle(J', L, J) → βRay(L, J') → mCircle(L, Segment[G, I]) → pIntersect(p, m, 1) → NMirror(N, h) → N'Ray(N', L) → nCircle(N', (2 * a)) → qIntersect(q, n, 1) → OEllipse(N, O, L) → rCircle(J, Segment[A, B]) → t