Bài 3. Cho ?ABC vuông t?i A, ???ng cao AH. G?i M, N l?n l??t là trung ?i?m c?a AH và BH. CMR: a) ?ABC ~ ?HAC t? ?ó suy ra $AC^2 = BC.CH$. b) $AH^2 = HB.HC$; c) ?AHN ~ ?CHM; d) AN ? CM.
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a) To prove that triangle JABC is similar to triangle AHAC, we need to show that their corresponding angles are equal and their corresponding sides are in proportion. Show more…
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