Cho tam giác ABC góc C= 90.( CA>CB). điểm I thuộc AB. trên bờ mặt phẳng A B có chứa điểm C kẻ tia Ax, By vuông góc AB .Đường thẳng vuông góc IC giao vs AX, By lần lượt là M, N.
 a CM tam giác CNB đồng dạng tam giác CIA
 b, Tam giác ACB  đồng dạng vs tam giác INC
c, chứng minh góc MIN = 90 độ, tìm vị trí của điểm I trên cạnh AB để Diện tích tam giác MIN = 2 diện tích tam giác ABC 

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