Exercise 3 6~ 1 1 answer of the sixth grade math book published by People's Education Press.

6. V: 3.14× (6 \ 2 )×12 squared =339. 12(cm3).

S:3. 14×(6 \ 2)×2+s squared: 3.14× (6 \ 212 = 282 (cm2).

7.1.5×1.5× 3.14× 2× 750 =1059.75 (kg)

= 10.5975 (ton)

8，2÷2= 1 (m)

1× 1×3. 14×0.25 = 0.785(m3)

35-0.785=34.2 15 (m3)

9,6 ÷ 2 = 3 (cm)

3× 3× 3.14×11× 3 = 932.58 (cubic centimeter)

Because 932.58 cubic centimeters > 800 cubic centimeters

So a drink with every guest is not enough.

10,81÷ 4.5 =18 (square decimeter)

18÷3=6 (decimeter)

1 1,10÷ 2 = 5cm 8÷ 2 = 4cm.

(5×5-4×4)×3. 14×80=2260.8 (cubic centimeter)