边长与三角形（二）
2014-03-19 08:37
本数学范例主要演示三角形的边长关系及其几何构造。结合等腰三角形、直角三角形和相似三角形等概念，用户可以通过动态调整边长来观察不同类型三角形的构成条件与性质。该工具利用点、线段、多边形、向量及角度等GeoGebra命令进行精确的几何作图，是学习三角形基本定理、几何不等式以及进行直观几何探索的优秀教学辅助工具。
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<labelMode val="1"/>
<lineStyle thickness="5" type="0" typeHidden="2" opacity="178"/>
<arcSize val="30"/>
</element>
<command name="Angle">
<input a0="C'" a1="C" a2="Rotate[C', If[abs(γ - 90°) < 1°, 90°, γ], C]"/>
<output a0="γ'"/>
</command>
<element type="angle" label="γ'">
<angleStyle val="0"/>
<value val="0.46049342505905916"/>
<show object="true" label="false" ev="4"/>
<condition showObject="closed ∧ γ' ≟ 90°"/>
<objColor r="0" g="0" b="0" alpha="0"/>
<layer val="0"/>
<labelMode val="1"/>
<lineStyle thickness="5" type="0" typeHidden="2" opacity="178"/>
<arcSize val="30"/>
</element>
</construction>
</geogebra>