Determine the length of DE — task. Mathematics State Board, Class 10.

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In the given triangle \(ABC\), \(DE \parallel BC\). If \(AD =\) 1 \(cm\), \(AB =\) 2 \(cm\), \(BC =\) 12 \(cm\), then the value of \(DE\) is \(cm\).

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10. Determine the length of DE