<construction> <!-- 第一个三角形 ABC --> <element type="point" label="A"><coords x="1.0" y="1.0" z="1.0"/></element> <element type="point" label="B"><coords x="4.0" y="1.0" z="1.0"/></element> <element type="point" label="C"><coords x="2.0" y="4.0" z="1.0"/></element> <command name="Polygon"><input a0="A" a1="B" a2="C"/><output a0="tri1"/></command> <element type="polygon" label="tri1"><show object="true" label="false"/><objColor r="0" g="100" b="255" alpha="0.2"/></element> <!-- 第二个三角形 A'B'C'（相似比 1:2） --> <element type="point" label="A'"><coords x="2.0" y="2.0" z="1.0"/></element> <element type="point" label="B'"><coords x="6.0" y="2.0" z="1.0"/></element> <element type="point" label="C'"><coords x="3.0" y="6.0" z="1.0"/></element> <command name="Polygon"><input a0="A'" a1="B'" a2="C'"/><output a0="tri2"/></command> <element type="polygon" label="tri2"><show object="true" label="false"/><objColor r="255" g="100" b="0" alpha="0.2"/></element> </construction>
