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L = 22/7 x 7 x 7 = 154 cm2
2. k = 22/7 x 21 = 66cm
L = 22/7 x 10.5 x 10.5 = 346.5 cm2
3. k = 3.14 x 20 =62.8 cm
L = 3.14 x 10 x 10 = 314 cm2
4. k = 3.14 x 10 = 31.4 cm
L = 3.14 x 5 x 5 = 78.5 cm2
5. k = 22/7 x 7 = 22cm
L = 22/7 x 3.5 x 3.5 = 38, 5 cm2