have managed to work out th centre of gravity by splitting the shape up into a rectagle and triangle but i dont know how to combine them to get a c.o.g for he full shape. the informaion is attatched.
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If we have two mass point than the centre of gravity is the weighted mean: $\displaystyle \vec r = (m_1*\vec {r_1} + m_2*\vec {r_2}) : (m_1 + m_2)$
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