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△ABOは二つの辺がどちらも円の半径と同じ長さなので二等辺三角形。二等辺三角形の二つの角は同じ大きさなので180-110=70(角OAB+角OBA)70÷2=35 x=35° 角ABCは90度なので90-35=55 y=55°
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