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三角形内角和定理演示 by Tim Brzezinski (2)

三角形内角和定理演示 by Tim Brzezinski (2)
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2015-11-18 09:28
测试改名0角几何作图
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 Polygons & Angles Polygons & Angles Polygons & Angles ( s n attar) Polygons & Angles Polygons & Angles Polygons & Angles Polygons & Angles Geometry: Polygons & Angles Geometry: Polygons & Angles Polygons & Angles
①本范例演示了任意三角形内角和恒等于180°的几何现象；②涉及的核心数学概念为三角形内角和定理、角度测量、多边形构造；③作图要点——使用GeoGebra命令Segment（线段）、Angle（角度）、Polygon（多边形）构建三角形，并标注内角α、β、γ及外角δ，通过动态演示验证定理；④适合初中及以上数学学习者，用于直观理解几何定理和空间关系。

GeoGebra 命令及参数

  1. Segment(A, B) → a
  2. Segment(B, C) → b
  3. Segment(C, A) → c
  4. Angle(B, A, C) → α
  5. Angle(C, B, A) → β
  6. Angle(A, C, B) → γ
  7. Polygon(A, B, C) → poly1, c_1, a_1, b_1