Cho 2 góc nhọn xOy và x’Oy’ Biết Ox song song với Ox’ Chứng mibh rằng xOy=x’Oy’
Question
Cho 2 góc nhọn xOy và x'Oy'
Biết Ox song song với Ox'
Chứng mibh rằng xOy=x'Oy'
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