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In a 45-45-90 triangle, the lengths of the legs are equal, and the relationship between the legs and the hypotenuse is given by the formula:
\[
\text{Leg} = \frac{\text{Hypotenuse}}{\sqrt{2}}
\]
Given that the hypotenuse is 4 cm, we can find the length of the leg as follows:
\[
\text{Leg} = \frac{4}{\sqrt{2}} = 4 \cdot \frac{\sqrt{2}}{2} = 2\sqrt{2} \text{ cm}
\]
Therefore, the length of the leg is \(2\sqrt{2}\) cm.
The correct response is:
**2√2 cm**