[tex]\displaystyle\\
2^{-1}\cdot2^2: \sqrt{4} = \frac{1}{2} \cdot 4 : 2 = \frac{4}{2} : 2 = 2:2 = \boxed{\bf 1}\\\\
\Longrightarrow~~\Delta ABC \text{ este congruent cu } \Delta A'B'C'\\\\
\Longrightarrow~~\boxed{\bf \Delta ABC \equiv \Delta A'B'C' }[/tex]
