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2 năm trước
cho điểm A nằm ngoài đường thẳng a.Vẽ cung tròn tâm cắt đường thẳng a ở B và C. Vẽ các cung tròn tâm B và C có cùng bán kính sao cho chúng cắt nhau tại 1 điểm khác A,gọi điểm đó là D. Hãy giải thích vì sao AD vuông góc với đường thẳng a. Ai giúp dược hứa vote 5 sao
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