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ii)kell=2(10)+1/4 x 2 x 3,14 x 5)=20+0,785=20,785cm
iii)kell=3(21)+(1/2 x 22/7 x 21) =63+33=96cm
iv)kell=1/2(2 x 3,14 x 10) + 2(1/2 x 3,14 x 10)=31,4+31,4=62,8cm