<?xml version="1.0" encoding="utf-8"?>
<CaR>
<Construction>
<Window x="8.799999999999999" y="6.3999999999999995" w="8.0"/>
<Objects>
<Point name="A" n="1" showname="true" bold="true" large="true" x="9.3" actx="9.3" y="4.5" acty="4.5" fixed="true">Point at &quot;9.3&quot;, &quot;4.5&quot;</Point>
<Point name="C" n="4" showname="true" bold="true" large="true" x="14.600000000000001" actx="14.600000000000001" y="4.5" acty="4.5" fixed="true">Point at &quot;14.600000000000001&quot;, &quot;4.5&quot;</Point>
<Text name="Text1" n="24" bold="true" large="true" x="1.1999999999999988" y="11.257142857142856">圖中紅色的曲線是以AB為直徑的半圓。
藍色的曲線是以AC為半徑的圓的一部分。
移動B點使兩條曲線的長度相同。</Text>
<Text name="Text2" n="35" hidden="super" bold="true" large="true" x="1.352380952380952" y="3.638095238095237">Target=157</Text>
<Circle name="c2" n="5" hidden="super" bold="true" large="true" through="C" midpoint="A" start="C" end="I7" acute="true">Circle around P1 through P3</Circle>
<Segment name="s2" n="10" bold="true" large="true" from="A" to="C">Line segment from P1 to P3</Segment>
<Circle name="c6" n="23" color="2" type="thick" bold="true" large="true" through="C" midpoint="A" start="C" end="B" acute="true">Circle around P1 through P3</Circle>
<Ray name="r2" n="28" hidden="super" bold="true" large="true" from="C" to="A">Ray from C pointing to A</Ray>
<PointOn name="B" n="13" type="thick" showname="true" xcoffset="0.0731485096038984" ycoffset="0.3391990817720174" keepclose="true" bold="true" large="true" on="c2" alpha="1.3404168581223428" x="10.510239009935853" y="9.65997301725789" shape="circle">Point on c2</PointOn>
<Intersection name="I7" n="30" hidden="super" bold="true" large="true" first="r2" second="c2" awayfrom="C" which="first">Intersection between r2 and c2</Intersection>
<Segment name="s4" n="14" hidden="super" bold="true" large="true" from="A" to="B">Line segment from P1 to P10</Segment>
<Midpoint name="M2" n="17" hidden="super" bold="true" large="true" first="A" second="B">Midpoint between P1 and P10</Midpoint>
<Angle name="t" n="33" hidden="super" showvalue="true" xcoffset="0.8333333333333321" ycoffset="0.6238095238095234" keepclose="true" unit="°" bold="true" large="true" first="C" root="A" second="B" acute="true">Angle C - A - B</Angle>
<Circle name="c4" n="20" color="5" type="thick" bold="true" large="true" through="B" midpoint="M2" start="B" end="A" acute="true">Circle around M2 through P10</Circle>
<Expression name="E1" n="34" showname="true" showvalue="true" x="1.28" y="9.68" value="round(100*rad(t))" prompt="答案1">Expression &quot;round(100*rad(t))&quot; at 1.3, 9.7</Expression>
</Objects>
</Construction>
</CaR>
