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Gốc chung là hai tia cắt nhau tại 1 điểm, tạo thành một góc có đỉnh là gốc đó. theo mình thì chỗ này gốc chung hoặc đỉnh góc luôn luôn là giao điểm mình nói đúng không ạ xong mình vote 5 sao cảm ơn nhiều ạ giúp mình với
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