A 3-D shape consists of a hollow sphere made of metal. The diagram shows a cross section drawn through the centre, $$\(O\)$$, of the sphere. Diagram NOT accurately drawn The internal radius of the sphere is $$\(1.2 \mathrm{~m}\)$$. The thickness of the metal is $$\(t \mathrm{~cm}\)$$. The density of the metal is $$\(2700 \mathrm{~kg}\)$$ per $$\(\mathrm{m}^{3}\)$$ The mass of the $$\(3-\mathrm{D}\)$$ shape is $$\(1980 \mathrm{~kg}\)$$. Work out the value of $$\(t\)$$. Give your answer correct to 2 significant figures. $$\(t=\)$$

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