✨ Best Answer ✨
△ABCで
40°+◯◯●●=180°
◯◯●●=140°
◯●=70°
△ACDで
Χ+◯●=180°
◯●=70°だから
Χ+70°=180°
Χ=110°
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✨ Best Answer ✨
△ABCで
40°+◯◯●●=180°
◯◯●●=140°
◯●=70°
△ACDで
Χ+◯●=180°
◯●=70°だから
Χ+70°=180°
Χ=110°
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