Math Problem Statement
cho tam giác abc nhọn (ab<ac), các đường cao ad, be, cf đồng quy tại H. gọi M, N lần lượt là trung điểm bc, ef. đoạn thẳng am cắt cf tại x, an cắt be tại y a) chứng minh hai tam giác aef và abc đồng dạng b) chứng minh góc BCH= HEF c) chứng minh: "xy// ac"
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Triangle Congruence
Parallel Lines
Perpendicularity
Formulas
AA similarity criterion
Properties of the orthocenter
Midline theorem
Theorems
Triangle Similarity (AA)
Orthocenter Properties
Midline Theorem
Suitable Grade Level
Grades 10-12
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