矩形面积与周长——固定面积
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所属专题
Mathematics Form 1
①本范例演示固定面积下矩形的形状变化;②涉及核心数学概念:面积、周长、矩形性质;③作图要点:使用Line、Point、Distance、If、DynamicCoordinates等GeoGebra命令构建动态图形;④适合初中及以上学生学习几何变换与优化问题。
GeoGebra 命令及参数
SelectedIndex(Bahasa) → nnLine(A, xAxis) → aPoint(a) → GDistance(A, G) → DPjIf(f ≟ true, round(DPj), DPj) → RABDynamicCoordinates(G, x(H), y(H)) → BDistance(A, B) → PjIf(nn ≟ 1, If[Tinggi ≟ 1, " unit", " units"], " unit") → textUTTextfield(Ls) → InputBox1Circle(A, Tinggi) → cOrthogonalLine(A, a) → bIntersect(c, b, 2) → CLine(C, a) → dLine(B, b) → eIntersect(d, e) → DPolygon(A, B, D, C) → poly1, a_1, b_1, d_1, c_1Perimeter(poly1) → PrMidpoint(A, B) → EVerticalText(Text[Tinggi] + textUT) → VTextMidpoint(A, C) → FIf(nn ≟ 1, If[Pj ≟ 1, " unit", " units"], " unit") → textUPIf(nn ≟ 1, "Perimeter = " + (Text[Pr]) + " units", "Perimeter = " + (Text[Pr]) + " unit") → text1