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Nguyenkhanhlinh999
2 năm trước
Cho xOy = 70. Trên tia Ox lấy A. Vẽ tia Ất sao cho xAt = 70°(tia At nằm trong góc xOy) a) Tia At có song song với Oy không? Vì sao? b) Vẽ AH vuông Ay (H thuộc Oy). Chứng tỏ AH vuông góc với At. c) Tinh số đo góc OAH.
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