三角形全等探究
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所属专题
Triangle congruence
①本范例通过交互式操作演示三角形全等的判定条件;②涉及核心数学概念包括三角形全等判定(SSS, SAS, ASA, AAS)、角度与边长的关系;③作图要点运用了点、多边形、线段、交点、角度等 GeoGebra 命令与对象;④适合初中及以上学生用于理解几何证明和探索几何性质。
GeoGebra 命令及参数
Point(Circle[A_{SS}, AB]) → B_{SS}Point(Circle[B_{SS}, BC]) → C_{SS}Polygon(A_{SS}, B_{SS}, C_{SS}) → tri_{SS}, c_{ss}, a_{ss}, b_{ss}Point(Circle[A_{SA}, AB]) → B_{SA}Point(Ray[Rotate[B_{SA}, (-angB), B_{SA}], Rotate[A_{SA}, angB, B_{SA}]]) → C_{SA}Polygon(A_{SA}, B_{SA}, C_{SA}) → tri_{SA}, c_{sa}, a_{sa}, b_{sa}Point(Circle[A_{SSS}, AB]) → B_{SSS}Point(Circle[B_{SSS}, BC]) → C_{SSS}Point(Circle[C_{SSS}, CA]) → AC_{SSS}Segment(A_{SSS}, B_{SSS}) → aSegment(B_{SSS}, C_{SSS}) → bSegment(C_{SSS}, AC_{SSS}) → cPolygon(A_{SSS}, B_{SSS}, C_{SSS}) → tri_{SSS}, c_{sss}, a_{sss}, b_{sss}Point(Circle[A_{SSA}, AB]) → B_{SSA}Point(Circle[B_{SSA}, BC]) → C_{SSA}Point(Ray[Rotate[C_{SSA}, (-angC), C_{SSA}], Rotate[B_{SSA}, angC, C_{SSA}]]) → AC_{SSA}Polygon(A_{SSA}, B_{SSA}, C_{SSA}) → tri_{SSA}, c_{ssa}, a_{ssa}, b_{ssa}Point(Circle[A_{AAS}, CA]) → C_{AAS}Point(Ray[Rotate[A_{AAS}, angA, A_{AAS}], Rotate[C_{AAS}, angA, A_{AAS}]]) → BA_{AAS}Intersect(Ray[Rotate[A_{AAA}, (-angA), A_{AAA}], Rotate[B_{AAA}, (-angA), A_{AAA}]], Ray[Rotate[B_{AAA}, angB, B_{AAA}], Rotate[A_{AAA}, angB, B_{AAA}]]) → C_{AAA}Polygon(A_{AAA}, B_{AAA}, C_{AAA}) → tri_{AAA}, c_{aaa}, a_{aaa}, b_{aaa}Angle(A_{SA}, B_{SA}, C_{SA}) → αSegment(A_{SSA}, B_{SSA}) → dSegment(B_{SSA}, C_{SSA}) → eSegment(C_{SSA}, AC_{SSA}) → fAngle(B_{SSA}, C_{SSA}, AC_{SSA}) → βSegment(A_{AAS}, C_{AAS}) → gSegment(A_{AAS}, BA_{AAS}) → hAngle(C_{AAS}, A_{AAS}, BA_{AAS}) → γPoint(Circle[A_{ASA}, CA]) → C_{ASA}Segment(A_{ASA}, C_{ASA}) → mPoint(Ray[Rotate[A_{ASA}, angA, A_{ASA}], Rotate[C_{ASA}, angA, A_{ASA}]]) → BA_{ASA}Segment(A_{ASA}, BA_{ASA}) → nPoint(Ray[Rotate[C_{ASA}, (-angC), C_{ASA}], Rotate[A_{ASA}, (-angC), C_{ASA}]]) → BC_{ASA}Segment(C_{ASA}, BC_{ASA}) → pIntersect(Ray[A_{ASA}, BA_{ASA}], Ray[C_{ASA}, BC_{ASA}]) → B_{ASA}Polygon(A_{ASA}, B_{ASA}, C_{ASA}) → tri_{ASA}, c_{asa}, a_{asa}, b_{asa}Angle(BA_{ASA}, A_{ASA}, C_{ASA}) → ζAngle(BC_{ASA}, C_{ASA}, A_{ASA}) → ηAngle(C_{AAA}, B_{AAA}, A_{AAA}) → θAngle(B_{AAA}, A_{AAA}, C_{AAA}) → ιAngle(A_{AAA}, C_{AAA}, B_{AAA}) → κPoint(Ray[Rotate[BA_{AAS}, angB, BA_{AAS}], Rotate[A_{AAS}, angB, BA_{AAS}]]) → CB_{AAS}Segment(BA_{AAS}, CB_{AAS}) → iAngle(CB_{AAS}, BA_{AAS}, A_{AAS}) → δIntersect(Ray[Rotate[C_{AAS}, (-angC), C_{AAS}], Rotate[A_{AAS}, (-angC), C_{AAS}]], Ray[Rotate[A_{AAS}, angA, A_{AAS}], Rotate[C_{AAS}, angA, A_{AAS}]]) → B_{AAS}Polygon(A_{AAS}, B_{AAS}, C_{AAS}) → tri_{AAS}, c_{aas}, a_{aas}, b_{aas}Point(Circle[A_{SAS}, AB]) → B_{SAS}Intersect(Circle[A_{SAS}, CA], Ray[Rotate[A_{SAS}, (-angA), A_{SAS}], Rotate[B_{SAS}, (-angA), A_{SAS}]]) → C_{SAS},Polygon(A_{SAS}, B_{SAS}, C_{SAS}) → tri_{SAS}, c_{sas}, a_{sas}, b_{sas}Angle(C_{SAS}, A_{SAS}, B_{SAS}) → ε
AI 绘图提示语参考
画三个三角形,分别展示边边边、边角边、角边角和角角边全等条件。每个三角形用不同颜色标注三边和三个角,并添加滑动条控制角度变化。先画出边边边全等的三角形,再画出边角边全等的三角形,接着是角边角全等的三角形,最后是角角边全等的三角形。每个三角形旁边标注对应的全等条件名称和角度大小,滑动条用于调整角度大小,观察全等条件的变化。
以上提示语为根据原始绘图命令整理而来,仅供参考。