<?xml version="1.0" encoding="utf-8"?>
<CaR>
<Construction>
<Window x="8.799999999999999" y="6.3999999999999995" w="8.0" showgrid="true"/>
<Objects>
<Point name="P17" n="37" bold="true" large="true" x="5" actx="5.0" y="6" acty="6.0" fixed="true">Point at &quot;5&quot;, &quot;6&quot;</Point>
<Point name="P" n="40" color="2" type="thick" showname="true" xcoffset="0.24761904761904852" ycoffset="0.1714285714285717" keepclose="true" bold="true" large="true" x="13.999999999999998" y="2.9904761904761905" shape="circle">Point at 14.0, 2.99</Point>
<Point name="P21" n="44" bold="true" large="true" x="13" actx="13.0" y="10" acty="10.0" fixed="true">Point at &quot;13&quot;, &quot;10&quot;</Point>
<Point name="P23" n="48" bold="true" large="true" x="10" actx="10.0" y="11" acty="11.0" fixed="true">Point at &quot;10&quot;, &quot;11&quot;</Point>
<Text name="Text1" n="84" bold="true" large="true" x="1.5" y="11.0">圖中的梯形有一條對稱軸。
移動P點使它變成另一個對稱的梯形。</Text>
<Text name="Text2" n="86" hidden="super" bold="true" large="true" x="1.5999999999999994" y="3.8095238095238093">Target=217</Text>
<Segment name="s12" n="41" bold="true" large="true" from="P17" to="P">Line segment from P17 to P</Segment>
<Segment name="s14" n="45" bold="true" large="true" from="P" to="P21">Line segment from P to P21</Segment>
<Segment name="s16" n="49" bold="true" large="true" from="P21" to="P23">Line segment from P21 to P23</Segment>
<Segment name="s18" n="52" bold="true" large="true" from="P23" to="P17">Line segment from P23 to P17</Segment>
<Midpoint name="M2" n="55" hidden="super" bold="true" large="true" first="P17" second="P23">Midpoint between P17 and P23</Midpoint>
<Midpoint name="M4" n="58" hidden="super" bold="true" large="true" first="P23" second="P21">Midpoint between P23 and P21</Midpoint>
<Polygon name="poly3" n="83" color="2" background="true" bold="true" large="true" point1="P23" point2="P17" point3="P" point4="P21">Polygon P23, P17, P, P21</Polygon>
<Expression name="E2" n="87" showname="true" showvalue="true" x="1.5809523809523802" y="9.066666666666666" value="round(100*x(P))" prompt="答案2">Expression &quot;round(100*x(P))&quot; at 1.6, 9.1</Expression>
<Expression name="E3" n="88" showname="true" showvalue="true" x="1.5809523809523802" y="8.666666666666666" value="round(100*y(P))" prompt="答案3">Expression &quot;round(100*y(P))&quot; at 1.6, 8.7</Expression>
<Plumb name="p2" n="61" hidden="super" bold="true" large="true" point="M2" line="s18" valid="true">Perpendicular line through M2 to s18</Plumb>
<Plumb name="p4" n="64" hidden="super" bold="true" large="true" point="M4" line="s16" valid="true">Perpendicular line through M4 to s16</Plumb>
<Plumb name="p6" n="70" hidden="super" point="P17" line="p4" valid="true">Perpendicular line through P17 to p4</Plumb>
<Plumb name="p8" n="79" hidden="super" point="P21" line="p2" valid="true">Perpendicular line through P21 to p2</Plumb>
<Intersection name="I3" n="71" hidden="super" first="p6" second="p4">Intersection between p6 and p4</Intersection>
<Intersection name="I7" n="80" hidden="super" first="p8" second="p2">Intersection between p8 and p2</Intersection>
<Circle name="c10" n="72" hidden="super" through="P17" midpoint="I3" acute="true">Circle around I3 through P17</Circle>
<Circle name="c12" n="81" hidden="super" through="P21" midpoint="I7" acute="true">Circle around I7 through P21</Circle>
<Intersection name="I4" n="73" color="2" first="p6" second="c10" awayfrom="P17" shape="circle" which="second">Intersection between p6 and c10</Intersection>
<Intersection name="T" n="82" hidden="super" showname="true" first="p8" second="c12" awayfrom="P21" which="second">Intersection between p8 and c12</Intersection>
<Expression name="E1" n="85" showname="true" showvalue="true" x="1.58" y="9.47" value="round(100*d(P,T))+217" prompt="答案1">Expression &quot;round(100*d(P,T))+217&quot; at 1.6, 9.5</Expression>
</Objects>
</Construction>
</CaR>
