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因為ABE是正三角形所以AB=BE=EA,角ABE=BEA=EAB=60度因為ABCD是正方形所以AD=AE=EB=BE,角DAB=ABC=90度所以角DAE=EBC=90-60=30度角CEB=ECB=(180-30)/2=75度角ADE=DEA=(180-30)/2=75度角CDE=90-75=15度祝你學習…
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