三角形外角定理动态演示
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所属专题
Congruence (CO) Cluster
Congruence (Vol 2)
CCSS High School: Geometry (Congruence) Volume 2
CCSS High School: Geometry (Congruence) Volume 2
CCSS High School: Geometry (Congruence) Volume 2
Geometry (Congruence) Volume 2
CCSS High School: Geometry (Congruence) Volume 2
CCSS High School: Geometry (Congruence) Volume 2
CCSS High School: Geometry (Congruence) Volume 2
CCSS High School: Geometry (Congruence) Volume 2
CCSS High School: Geometry (Congruence) Volume 2
CCSS High School: Geometry (Congruence) Volume 2
Gail LeBlancCCSS High School: Geometry (Congruence) Volume 2
CCSS High School: Geometry (Congruence) Volume 2
CCSS High School: Geometry (Congruence) Volume 2
Triangle Theorems
Unit 7: Polygons and Quadrilaterals
① 本范例通过GeoGebra动态几何环境,直观演示三角形外角等于不相邻两内角之和的定理,并展示外角与内角的关系。② 核心数学概念是三角形外角定理,涉及角的度量、三角形内角和、外角定义以及几何推理。③ 作图要点:利用GeoGebra的Line、Ray、Segment构造三角形及其边的延长线,使用Angle命令标记并度量各角,通过Point、Intersect、Polygon等对象构建基本图形,并借助Rotate、Translate、Dilate等变换工具辅助展示动态变化,同时使用Slider或动态点控制三角形形状,以便观察外角与内角关系的恒定性。④ 适合初中几何教学、高中几何复习以及数学教师制作交互式课件,也可用于学生自主探索三角形外角性质。
GeoGebra 命令及参数
Line(A, B) → fSlope(f) → aPointIn(c) → CSegment(A, C) → gSegment(C, B) → hSegment(B, A) → iMin(list1) → dCircle(A, (0.2 * d)) → eCircle(B, (0.2 * d)) → kCircle(C, (0.2 * d)) → pRay(A, B) → jRay(B, C) → lRay(C, A) → mPoint(j) → DPoint(l) → EPoint(m) → FRay(B, D) → nRay(C, E) → qRay(A, F) → rIntersect(p, g, 1) → GIntersect(p, h, 1) → HIntersect(e, i, 1) → IIntersect(e, g, 1) → JCircleSector(A, I, J) → sCircleSector(C, G, H) → tPolygon(A, B, C) → poly1, c_1, a_1, b_1Dilate(A, If[0 < o ≤ 1, 1 - o, 0], B) → A'Vector(A, A') → uTranslate(s, u) → s'CircleArc(A, I, J) → d_1Distance(A, I) → vRotate(t, If[1 < o ≤ 2, ((o - 1) * pi), pi], C) → t'CircleArc(C, G, H) → e_1Angle(G, C, H) → αDilate(C, If[2 < o ≤ 3, 3 - o, 0], B) → C'Vector(C, C') → u_1Translate(t', u_1) → t''Intersect(k, n) → K,Intersect(k, h) → L,CircleArc(B, K, L) → f_1