Geometry: An Interactive Journey to Mastery

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   the following.
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   E௘ͽ /LVWDOOWKHͼ௘FDSLWDO௘ͽOHWWHUVRIWKHDOSKDEHWWKDWKDYHYHUWLFDOOLQHV\PPHWU\
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... Figure 30.4