[General]
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[Point1]
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[Point2]
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[Point3]
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[Point4]
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[Point5]
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[Point6]
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[Point7]
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[Misc]
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[Figure1]
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[Figure2]
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[Figure3]
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[Figure4]
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[Figure5]
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[Figure6]
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[Figure7]
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[Label1]
Caption=This drawing shows how to build a parabola~~given its focus and directrix. ~~~~Let AB is the directrix of the parabola and C~~is a point on it. Segment s connects C with the~~focus.~~~~When point C moves, the intersection of lines~~l and m describes the parabola,~~where line l is perpendicular to the directrix and~~passing through C, and m is a line perpendicular to ~~segment s, and contains its middlepoint. ~~~~In this way the resulting parabola point~~is equidistant from the directrix and the focus.~~~~Note: line m is the tangent line for the parabola.
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[Label2]
Caption=Constructing parabola~~by given focus and directrix
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[Button1]
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Forecolor=-2147483630
X=-9.03003450391257
Y=-3.82628580674261
Path=three circles.dgf

[Button2]
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Caption=Next >
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Forecolor=-2147483630
X=7.53013046766946
Y=-3.82628580674261
Path=pentagon.dgf

