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[HK]基本幾何

Figure: http://i890.photobucket.com/albums/ac104/s102003/ddd-1.png
In the figure, ABCD and DEFG are two equal squares. BC and EF intersects at H. If AngleADE = 30degree,
a) find Angle BHE
b) find Angle GCH
c) find Angle EAB

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修正(2)~~~~為等腰三角形.....感謝楓葉提醒