4 The diagram shows a uniform lamina \(A B C D E F G H\).
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- Explain why the centre of mass is 25 cm from \(A H\).
- Show that the centre of mass is 4.375 cm from \(H G\).
- The lamina is freely suspended from \(A\). Find the angle between \(A B\) and the vertical when the lamina is in equilibrium.
- Explain, briefly, how you have used the fact that the lamina is uniform.