Cho góc $\widehat{xOy}$, điểm I nằm trong góc đó. Kẻ IC vuông góc Ox, ID vuông góc Oy sao cho IC=ID=a. Kẻ đường thẳng đi qua I cắt Ox tại A, Oy tại B.
a) CMR AC.BD không đổi
b) CMR $\frac{AC}{BD}=\frac{OA^2}{OB^2}$
c) Xác định AB để BD = 4 CA
d) Biết $S_{ABC}=\frac{8a^2}{3}$. Tính AC, BD theo a

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