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(1)","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"center","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"@108278603426@@108278691525@","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"left","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"2. Một số hệ thức liên quan tới đường cao","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h2"},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Định lý 2","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h3"},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Trong một tam giác vuông, bình phương đường cao ứng với cạnh huyền bằng tích hai hình chiếu của hai cạnh góc vuông trên cạnh huyền.","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"@108337900373@","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":2,"mode":"normal","style":"","text":"Định lí 2","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null},{"detail":0,"format":0,"mode":"normal","style":"","text":" thiết lập mối quan hệ giữa đường cao ứng với cạnh huyền và các hình chiếu của hai cạnh góc vuông trên cạnh huyền của một tam giác vuông. ","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null},{"detail":0,"format":2,"mode":"normal","style":"","text":"Định lí 3","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null},{"detail":0,"format":0,"mode":"normal","style":"","text":" dưới đây thiết lập mối quan hệ giữa đường cao này với cạnh huyền và hai cạnh góc vuông.","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Định lý 3","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h3"},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Từ công thức tính diện tích tam giác, ta nhanh chóng suy ra hệ thức 3.","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Ta có, diện tích tam giác $ABC$ bằng: $\\dfrac{1}{2}AH.BC$","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Mặt khác, tam giác $ABC$ vuông tại $A$ nên diện tích có thể được tính bằng: $\\dfrac{1}{2}AB.AC$","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Suy ra: $\\dfrac{1}{2}AH.BC=\\dfrac{1}{2}AB.AC$","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Do đó, $AH.BC=AB.AC$.","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Trong một tam giác vuông, tích hai cạnh góc vuông bằng tích của cạnh huyền và đường cao tương ứng.","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"@108337906195@","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Định lý 4","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h3"},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"@108337905664@","type":"extended-text","version":1,"note":"","noteHtml":"","textTranslaterHtml":"","typeTextTranslater":null}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Ta thấy, kết quả 2 bài tập đều hoàn toàn giống nhau. 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