点到直线或平面的距离
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①本范例演示了如何计算点与直线或平面之间的距离;②涉及的核心数学概念包括向量、投影、解析几何、余弦定理;③作图要点——使用了Textfield, Translate, Vector, Distance, OrthogonalLine, Intersect, Midpoint, Line, Segment, Angle, ProjectPoint, XandYline等GeoGebra命令/对象;④适合高中及以上学生学习和理解空间几何与解析几何问题。
GeoGebra 命令及参数
Textfield(P) → InputBox1Textfield(n) → InputBox2Translate(P, n) → P'Vector(P, P') → uTextfield(Q) → InputBox3Vector(P, Q) → vDistance(Q, plane) → D_{plane}OrthogonalLine(Q, plane) → fIntersect(f, plane) → DVector(D, Q) → wMidpoint(D, Q) → ELine((x(P), y(P), z(P)), Vector[(x(n), y(n), z(n))]) → lineOrthogonalLine(Q, line, space) → gIntersect(line, g) → MSegment(M, Q) → hMidpoint(h) → NAngle(P', P, Q) → αProjectPoint(Q) → A, lProjectPoint(P) → B, mXandYline(B) → p, qXandYline(A) → r, sSegment(F, G) → t