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5.9.2/2= 45 cm^2
7.8.2/2= 56 cm^2
5.7 = 35 cm^2
45 + 56 + 35 = 136 cm ^2
no. 5
32.22.2 = 1408 cm^2
42.22.2 = 1848 cm^2
42.32.2= 2688 cm^2
1408 + 1848 + 2688= 7224 cm^2