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)
Gọi $H$ là hình chiếu của $D$ trên $AC$
Do B'D và DH vuông góc với AC nên theo định lí ba đường vuông góc $DH \bot AC$
Ta có $S_{ACB'}=\frac{1}{2}AC.B'H $
Trong đó $AC=\sqrt{AB^2+BC^2 }=\sqrt{a^2+b^2 } $
$\frac{1}{DH^2}=\frac{1}{DA^2}+\frac{1}{DC^2}=\frac{1}{b^2}+\frac{1}{a^2}=\frac{a^2+b^2}{a^2b^2} \Rightarrow DH=\frac{ab}{\sqrt{a^2+b^2 } } $
Trong $\Delta$ vuông B'DH: $B'H=\sqrt{B'D^2+DH^2}=\sqrt{c^2+\frac{a^2b^2}{a^2+b^2}}=\sqrt{\frac{a^2c^2+a^2b^2+c^2b^2}{a^2+b^2}}$
$ $
Vậy $S_{ACB'}=\frac{1}{2}\sqrt{a^2+b^2 }\sqrt{\frac{a^2b^2+b^2c^2+c^2a^2}{a^2+b^2} } =\frac{1}{2}\sqrt{a^2b^2+b^2c^2+c^2a^2 } $