1.2 1,22.4

2. (from left to right) 3. 14×5×5×2= 157 (cubic centimeter)

2

3.14× (4÷ 2 )×12 =150.72 (cubic centimeter)

2

3.14× (8 ÷ 2 )× 8 = 401.92 (cubic centimeter)

2

3.3.14× (56 ÷ 2 )× 87 = 214173.12 (cubic decimeter) = 214177.

2

4.3.14× (3÷ 2 )× 0.5× 2 = 7.065 (square)

5.8016 = 5cm

2

6. Surface area (from left to right): 3.14× 6×12+3.14× (6÷2 )× 2 = 282.6 (square centimeter).

2

Volume: 3.14× (6÷ 2 )×12 = 339.12.

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I can only write so much. I hope my answer will satisfy you. I only wrote six questions. I'm sorry