通过观察确定直线的斜率
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①本范例演示通过观察确定直线的斜率;②涉及的核心数学概念包括斜率、线性函数、直线;③作图要点——使用了 GeoGebra 命令 Sequence, Union, Random, Line, FractionText, Intersect, Polygon, Vector, Angle, Distance, Textfield, Slope;④适合高中阶段学习解析几何的学生使用。
GeoGebra 命令及参数
Sequence(i, i, -10, -1) → aSequence(i, i, -5, 5) → wSequence(i, i, -10, -1) → bSequence(i, i, 1, 10) → cUnion(b, c) → dRandom(-12, 12) → eLine(A, B) → gFractionText(Slope[f]) → text1FractionText(f(0)) → text2Intersect(h, i) → CPolygon(A, C, B) → poly1, b_1, a_1, c_1Vector(A, C) → uVector(C, B) → vAngle(B, C, A) → αDistance(A, C) → distanceACDistance(C, B) → distanceCBTextfield(n) → InputBox1Line(A, B) → pSlope(p) → oFractionText(n) → text3FractionText(n) → text6