Xác định tọa độ các đỉnh hình chữ nhật ABCD biết AB : x-y=0,tâm I(0;3) vad có diên tích là 4 căn 2

A(a;a) thuộc AB: x-y=0 => C(-a;6-a)

gọi K là trung điểm AB => IK vuông góc AB => vecto chỉ phương AB là pháp tuyến của IK => IK giao AB = K(3/2 ; 3/2)

=> B(3-a;3-a).

S = 4\sqrt{x} 2 = AB.BC => a là OK

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