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The diagram below shows a rectangle measuring 15 cm by 12 cm from which two semi-circles each of a diameter 5.6 cm are removed. The figure represents the cross section of a wooden block 10.5 metres long. The wood making the block has a density of 0.8 g/#cm^3#.
a) Calculate to one decimal place
i. the cross sectional area of the block
ii. the mass of the wood in the block in kilograms.