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ngokimlienchauhoa
2 năm trước
Bài 13: Cho Oz là tia phân giác của góc xOy. CMR: xOz = 1/2 xOy. Bài 14: Cho góc xOy có xOy = ( 0 <a< 1800 ). Trên nửa mặt phẳng bờ chứa tia Ox, vẽ tia Oz sao cho xOz = a/2 . CMR: Oz là tia phân giác của góc xOy. Bài 15: Hãy vẽ ba tia chung gốc Ox, Oy, Oz, trong đó xOz = zOy mà Oz không phải là tia phân giác của góc xOy. Bài 16: Cho góc bẹt AOB. Trên cùng một nửa mặt phẳng có bờ AB, vẽ các tia OC, OD sao cho AOC = 700, BOD = 550. CMR: Tia OD là tia phân giác của góc BOC.
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