确定缺失角度:几何作图与四边形性质
几何画板及绘图内容加载中,请稍等……
该范例演示了如何通过几何作图确定缺失角度,涉及平行四边形、菱形、梯形等特殊四边形的性质。作图要点包括使用GeoGebra命令如Random、Shuffle、Rotate、Line、Circle、Intersect、Angle等来构造图形。适合小学五年级至六年级学生,用于学习几何作图和四边形性质的应用。
GeoGebra 命令及参数
Random(1, 360) → randomgradShuffle(Sequence[i, i, 70, 100]) → alphaList, {96, 71, 79, 83, 88, 77, 91, 98, 70, 85, 87, 76, 94, 78, 97, 99, 81, 84, 82, 75, 90, 80, 72, 95, 74, 92, 100, 86, 89, 73, 93}Shuffle(Sequence[i, i, minbeta + 40, maxbeta - 30]) → betaList, {92, 91, 93, 96, 95, 99, 97, 94, 90, 98, 100}Rotate(MKreis + (0, b), randomgrad°, MKreis) → ALine(A, MKreis) → jRotate(SenkP, (-(α / 2)) + randomgrad°, A) → SenkP'_{1}Ray(A, SenkP'_{1}) → fCircle(A, a) → cIntersect(c, f) → B,Rotate(A, (-β), B) → B'Ray(B, B') → iShuffle({1, 2, 3, 4}) → gesuchtListe, {3, 2, 4, 1}Rotate(SenkP, α / 2 + randomgrad°, A) → SenkP'Ray(A, SenkP') → gIntersect(c, g) → D, C_{1}Angle(B, A, D) → alpRotate(A, β, D) → A'Ray(D, A') → hIntersect(i, j) → CAngle(D, C, B) → gamTextfield(input1) → InputBox1Textfield(input2) → InputBox2Polygon(PtopLeftCornerFeedback, PtopRightCornerFeedback, PbottomRightCornerFeedback, PbottomLeftCornerFeedback) → rectangleCorrect, rectangleCorrectS3, rectangleCorrectS4, rectangleCorrectS2, rectangleCorrectS1Shuffle(Sequence[Random[0, 10], i, 1, 100]) → randomNosForX, {2, 10, 9, 4, 8, 9, 5, 10, 9, 6, 5, 5, 5, 10, 9, 0, 5, 10, 2, 4, 3, 4, 5, 6, 7, 8, 10, 5, 4, 7, 7, 6, 4, 6, 1, 1, 10, 10, 0, 1, 6, 1, 4, 8, 1, 2, 3, 4, 4, 6, 2, 4, 10, 6, 5, 3, 7, 10, 5, 10, 0, 2, 8, 5, 9, 7, 7, 0, 9, 4, 3, 6, 6, 0, 9, 7, 1, 1, 8, 5, 0, 2, 3, 7, 1, 6, 9, 5, 1, 1, 8, 2, 3, 7, 5, 4, 5, 6, 10, 10}Element(randomNosForX, Mod[questionCount, 100] + 1) → numXShuffle(Sequence[Random[0, 10], i, 1, 100]) → randomNosForY, {1, 8, 0, 0, 5, 8, 6, 2, 5, 2, 7, 1, 6, 3, 8, 7, 6, 0, 1, 5, 10, 6, 6, 3, 3, 10, 3, 7, 6, 10, 1, 10, 4, 3, 7, 8, 4, 0, 10, 9, 9, 5, 7, 5, 5, 3, 0, 6, 9, 8, 3, 10, 6, 9, 4, 7, 9, 6, 1, 4, 8, 4, 5, 4, 6, 9, 7, 0, 4, 5, 3, 3, 7, 6, 2, 8, 8, 5, 2, 10, 8, 9, 5, 5, 4, 10, 3, 6, 3, 5, 3, 3, 2, 4, 0, 5, 9, 5, 3, 4}Element(randomNosForY, Mod[questionCount, 100] + 1) → numYAppend(true, Sequence[If[randomNosForX(i) ≟ randomNosForX(i - 1), false, true], i, 2, 100]) → stayXAppend(true, Sequence[If[randomNosForY(i) ≟ randomNosForY(i - 1), false, true], i, 2, 100]) → stayYRemove(Sequence[If[stayX(i), randomNosForX(i), 0], i, 1, 100], Sequence[0, i, 1, 100]) → randomNosForXwithoutRepeatRemove(Sequence[If[stayY(i), randomNosForY(i), 0], i, 1, 100], Sequence[0, i, 1, 100]) → randomNosForYwithoutRepeatElement(randomNosForXwithoutRepeat, Mod[questionCount, Length[randomNosForXwithoutRepeat]] + 1) → numXwithoutRepeatElement(randomNosForYwithoutRepeat, Mod[questionCount, Length[randomNosForYwithoutRepeat]] + 1) → numYwithoutRepeatDefined(input1) → fixedAngle(SenkP, A, SenkP') → SantasLittleHelper2Angle(SenkP'_{1}, A, SenkP) → SantasLittleHelper1Angle(A, D, C) → delAngle(C, B, A) → betIf(gesucht ≟ 1 ∨ gesucht ≟ 3, RandomElement[{2, 4}], gesucht ≟ 2, RandomElement[{1, 3, 4}], gesucht ≟ 4, RandomElement[{1, 2, 3}]) → gesucht2Midpoint(A, C) → ECircle(MKreis, 4) → dRotate(A + (0, 0.5), randomgrad°, A) → BeschPosARotate(C + (0, -0.5), randomgrad°, C) → BeschPosCRotate(B + (-0.5, 0), randomgrad°, B) → BeschPosBRotate(D + (0.5, 0), randomgrad°, D) → BeschPosDMidpoint(B, D) → MDeltText(BeschriftungAlpha, BeschPosAlpha, false, true, 0, 0) → Text10Text(BeschriftungBeta, BeschPosBeta, false, true, 0, 0) → Text11Text(BeschriftungGamma, BeschPosGamma, false, true, 0, 0) → Text12Text(BeschriftungDelta, BeschPosDelta, false, true, 0, 0) → Text13Text(BeschA, BeschPosA, false, true, 0, 0) → Text14Text(BeschB, BeschPosB, false, true, 0, 0) → Text15Text(BeschC, BeschPosC, false, true, 0, 0) → Text16Text(BeschD, BeschPosD, false, true, 0, 0) → Text17
AI 绘图提示语参考
在平面上先放置一个中心点,并以它为圆心画一条半径为 a 的圆;在圆上取两点,用旋转作出第二条与第一条对称的射线方向。连接中心点与其中一射线与圆的交点,得到一条角所在的射线与另一射线;再在另一射线上取与圆相交点,形成与前者对应的两点。对这两条射线围成的顶角分别标注三个角度(分别是圆上点与中心点、以及由圆上点与另一构造点形成的角),并在图中加入两个输入框用于填写角度大小。最后画一个四边形,采用给定的四个角点位置(可理解为上左、上右、下右、下左)作为最终图形。
以上提示语为根据原始绘图命令整理而来,仅供参考。