<?xml version="1.0" encoding="utf-8"?>
<CaR>
<Construction>
<Window x="8.799999999999999" y="6.3999999999999995" w="8.0"/>
<Objects>
<Point name="O" n="2" hidden="super" showname="true" bold="true" large="true" x="4" actx="4.0" y="2" acty="2.0" fixed="true">Point at &quot;4&quot;, &quot;2&quot;</Point>
<Point name="P3" n="3" hidden="super" bold="true" large="true" x="14" actx="14.0" y="7" acty="7.0" fixed="true">Point at &quot;14&quot;, &quot;7&quot;</Point>
<Point name="B" n="4" showname="true" bold="true" large="true" x="14" actx="14.0" y="2" acty="2.0" fixed="true">Point at &quot;14&quot;, &quot;2&quot;</Point>
<Point name="A" n="72" showname="true" bold="true" large="true" x="7" actx="7.0" y="2" acty="2.0" fixed="true">Point at &quot;7&quot;, &quot;2&quot;</Point>
<Text name="Text1" n="90" bold="true" large="true" x="1.542857142857142" y="11.104761904761904">圖中綠色的四邊形是鷂形。
移動P點使三角形APB的周界為最小。</Text>
<Text name="Text2" n="115" hidden="super" bold="true" large="true" x="1.561904761904761" y="5.371428571428571">Target=154</Text>
<Segment name="s4" n="10" bold="true" large="true" from="O" to="B">Line segment from O to B</Segment>
<Segment name="s6" n="13" bold="true" large="true" from="B" to="P3">Line segment from P4 to P3</Segment>
<Segment name="s10" n="19" hidden="super" bold="true" large="true" from="O" to="P3">Line segment from O to P3</Segment>
<Plumb name="p2" n="33" hidden="super" point="B" line="s10" valid="true">Perpendicular line through P4 to s10</Plumb>
<Plumb name="p6" n="78" hidden="super" point="A" line="s10" valid="true">Perpendicular line through P30 to s10</Plumb>
<Intersection name="I3" n="34" hidden="super" first="p2" second="s10">Intersection between p2 and s10</Intersection>
<Intersection name="I11" n="79" hidden="super" first="p6" second="s10">Intersection between p6 and s10</Intersection>
<Circle name="c2" n="35" hidden="super" through="B" midpoint="I3" acute="true">Circle around I3 through P4</Circle>
<Circle name="c14" n="80" hidden="super" through="A" midpoint="I11" acute="true">Circle around I11 through P30</Circle>
<Intersection name="I4" n="36" hidden="super" first="p2" second="c2" awayfrom="B" which="second">Intersection between p2 and c2</Intersection>
<Intersection name="I12" n="81" hidden="super" first="p6" second="c14" awayfrom="A" which="second">Intersection between p6 and c14</Intersection>
<Segment name="s18" n="56" bold="true" large="true" from="O" to="I4">Line segment from O to I4</Segment>
<Segment name="s20" n="59" bold="true" large="true" from="I4" to="P3">Line segment from I4 to P3</Segment>
<Segment name="s28" n="94" hidden="super" bold="true" large="true" from="I12" to="A">Line segment from I12 to P30</Segment>
<Segment name="s30" n="97" hidden="super" bold="true" large="true" from="I4" to="B">Line segment from I4 to P4</Segment>
<Segment name="s17" n="110" hidden="super" bold="true" large="true" from="I4" to="A">Line segment from I4 to A</Segment>
<Intersection name="Q" n="99" hidden="super" showname="true" bold="true" large="true" first="s28" second="s10">Intersection between s28 and s10</Intersection>
<Intersection name="I18" n="102" hidden="super" bold="true" large="true" first="s30" second="s10">Intersection between s30 and s10</Intersection>
<Intersection name="T" n="111" hidden="super" showname="true" bold="true" large="true" first="s17" second="s10">Intersection between s17 and s10</Intersection>
<Segment name="s32" n="103" hidden="super" bold="true" large="true" from="Q" to="I18">Line segment from Q to I18</Segment>
<Segment name="s14" n="107" hidden="super" bold="true" large="true" from="O" to="I18">Line segment from O to I18</Segment>
<Expression name="t" n="113" hidden="super" showname="true" showvalue="true" x="1.5809523809523804" y="9.257142857142856" value="(x(T)-x(O))/(x(Q)-x(O))" prompt="t">Expression &quot;(x(T)-x(O))/(x(Q)-x(O))&quot; at 1.6, 9.3</Expression>
<PointOn name="P" n="22" color="2" type="thick" showname="true" xcoffset="-0.4228571428571435" ycoffset="0.3885714285714288" keepclose="true" bold="true" large="true" on="s14" alpha="0.8733333333333332" x="10.986666666666665" y="5.493333333333332" shape="circle">Point on s10 </PointOn>
<Segment name="s12" n="23" bold="true" large="true" from="B" to="P">Line segment from P4 to P</Segment>
<Segment name="s16" n="39" bold="true" large="true" from="I4" to="P">Line segment from I4 to P</Segment>
<Segment name="s24" n="84" hidden="super" bold="true" large="true" from="I12" to="P">Line segment from I12 to P</Segment>
<Segment name="s26" n="87" bold="true" large="true" from="P" to="A">Line segment from P to P30</Segment>
<Polygon name="poly1" n="88" color="5" hidden="super" background="true" bold="true" large="true" point1="O" point2="I12" point3="P" point4="A">Polygon O, I12, P, A</Polygon>
<Polygon name="poly2" n="89" color="1" background="true" bold="true" large="true" point1="P" point2="I4" point3="P3" point4="B">Polygon P, I4, P3, P4</Polygon>
<Polygon name="poly3" n="104" color="2" background="true" bold="true" large="true" point1="A" point2="P" point3="B">Polygon A, P, B</Polygon>
<Expression name="r" n="112" hidden="super" showname="true" showvalue="true" x="1.58" y="9.700000000000001" value="(x(P)-x(O))/(x(Q)-x(O))" prompt="r">Expression &quot;(x(P)-x(O))/(x(Q)-x(O))&quot; at 1.6, 9.7</Expression>
<Expression name="E3" n="114" showname="true" showvalue="true" x="1.542857142857142" y="8.647619047619047" value="round(100*r)" prompt="答案1">Expression &quot;round(100*r)&quot; at 1.5, 8.6</Expression>
</Objects>
</Construction>
</CaR>
