Math Problem Statement
cho tứ diện ABCD có M là trung điểm AB, N là điểm thuộc AC sao cho NA/NC=2. Mặt phẳng (a) thay đổi đi qua M,N cắt cạnh BD,CD ở P,Q. CM MN,PQ,BC đồng quy
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Tetrahedrons
Menelaus' Theorem
Formulas
Menelaus' theorem: (MB/MA) * (NA/NC) * (QC/QD) * (PD/PB) = 1
Theorems
Menelaus' Theorem
Suitable Grade Level
High School - Grades 10-12
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