Sử dụng định nghĩa về góc bẹt để chứng minh định lý về tổng số đo hai góc kề bù.

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Vẽ 2 góc kề bù xOy và yOz, biết góc xOy=70. Vẽ Ot là tia phân giác của góc yOz. Tính số đo góc xOz, yOt và xOT. Bài 3.3 trang 45 Toán 7 Tập 1: Vẽ góc xOy có số đo bằng 60o. Vẽ tia Om là tia đối của tia Ox. a) Viết tên hai góc kề bù có trong hình vừa vẽ. b) Tính số đo góc ... Aug 7, 2022 ... Cho tam giác ABC có ba góc nhọn (AB

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