21) a) Volume = (22/7x6^2) x 18 = 2036.57 in
b) Surface area = 113.14+113.14= 226.28 + ((22/7x12) x 18) = 904.85 in
22) a) volume = (22/7 x36x16)/3=602.88 mm
b) Surface area =435.2 mm
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