\(\Delta ABO \sim \Delta A'B'O'\), ta có hệ thức:
\( \dfrac{A'B'}{AB}=\dfrac{OA'}{OA} \Rightarrow \dfrac{h'}{h}=\dfrac{d'}{d}\Rightarrow h'= \dfrac{h.d'}{d}=0,64(cm)\)
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