角平分线定理(第一部分)——交互式探究
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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
CCSS High School: Geometry (Congruence) Volume 2
Gail LeBlancCCSS High School: Geometry (Congruence) Volume 2
Honors Geometry
① 本范例通过动态几何交互演示角平分线定理的核心内容:在三角形中,角平分线将对边分成的两条线段与相邻两边成比例。② 涉及的核心数学概念包括角平分线、线段比例、相似三角形以及几何定理的验证与发现。③ 作图要点:从构造摘要可见,使用了Ray、Point、Segment、Length、OrthogonalLine、Circle、Intersect、AngularBisector、Line、Distance、Angle等GeoGebra命令,构建了三角形ABC、角平分线及其与对边的交点,并通过测量距离(distanceEb、distanceEa)和角度(α、β)来动态展示比例关系,还包含按钮(button1)用于交互控制。④ 适合中学几何学段,用于课堂探究、学生自主发现角平分线定理,也可作为教师演示工具,帮助理解定理的几何意义与证明思路。
GeoGebra 命令及参数
Ray(G, H) → pPoint(p) → ISegment(G, I) → qLength(q) → rRay(A, B) → aRay(A, C) → bOrthogonalLine(A, a) → dCircle(A, r) → eIntersect(e, d) → F_1, G_1OrthogonalLine(A, b) → gAngularBisector(C, A, B) → sIntersect(e, g, 2) → DLine(C, g) → fLine(D, b) → iIntersect(s, i) → EDistance(E, b) → distanceEbDistance(E, a) → distanceEaRay(A, E) → cOrthogonalLine(E, a) → hOrthogonalLine(E, b) → jIntersect(h, a) → FIntersect(j, b) → JSegment(E, F) → kSegment(E, J) → lAngle(E, J, A) → αAngle(A, F, E) → β