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<construction title="" author="" date="">
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<command name="Circle">
<input a0="o" a1="4"/>
<output a0="c"/>
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<eqnStyle style="specific"/>
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<input a0="c"/>
<output a0="A"/>
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<expression label="text1" exp=""O點是這個圓的圓心，
試移動紅色A點和B點，
看看你們能否找出圓形內的最長直線？""/>
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<expression label="text2" exp=""AB的距離：" + f_1 + " cm"" />
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