角BCAは対角なので、70°
角BACは円周角の定理で、直径の対角にあたるので90°になります。よって、xは
x=180°-(90°+70°)=20°
また角DCBは180°-70°=110°
角CBDは180°-90°-70°=20°
よって、yは
y=180°-110°-20°=50°
となります。
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