Sixteen answers to math exercises in the first volume of the sixth grade

2 3.14×10×10 = 314 square meter.

3 squared (125.6 ÷ 3.14 ÷ 2) × 3.14 = 62.8 square centimeters.

4 3. 14× 12× 12-3. 14×8×8 = 25 1.2 cm2。

3.14× (10 ÷ 2 )× (10 ÷ 2)-(10 ÷ 2 )× (10 ÷ 2) ×

5 circumference: 3.14×10 = 31.4cm area: 3.14× 5 = 78.5cm.

Circumference: 3. 14×3×2= 18.84 cm area: 3. 14×3×3=28.26 cm.

6 circumference: 3.14× 32× 2+100× 2 = 200.96m.

Area: 3.14× 32× 32+100× 32× 2 = 9415.36 m2.

7 1 serving: 3.14× 5× 5 ÷ 4 =19.625 cm2.

The score of 3 is: 3. 14×5×5÷4×3 = 58.875 square centimeters.