Calculate the side AD of triangle ABC — task. Maths CBSE Live product, Class 10 (2025-26).

In \(\triangle ABC\), \(DE \parallel BC\) and \(\frac{AE}{EC} = \frac{1}{5}\). If \(DB = 4 \ cm\), then \(AD =\) \(cm\).

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2. Calculate the side AD of triangle ABC