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thienkfbc
2 năm trước
cho nửa đg tròn tâm O đg kính AB =2R trên nửa mp chứa nửa đg tròn kẻ tiếp tuyến Ax điểm C nằm trên nửa đg tròn sao cho AC=R a)tính số đ các góc ΔABC b)tiếp tuyến tại C của (O) cắt Ax tại D .cm OD//BC c)tia BC cắt Ax tại E cm DE=DA d) kẻ CH vg AB vs H ∈AB BD cắt CH tại I cm I là trung điểm CH
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