Answers to the sixth grade mathematics textbook (People's Education Edition) Mathematicians Education Edition P 16 7.8.9. 10. P 17. 13. 14 important process! ! ! People's education edition mathematics book Absolutely genuine, please don't copy, I am Fang.

Question 7: 3.14 *1.2 * 2 = 7.536 (square meters)

Question 8: 3.14 *1.5 * 2.5 =11.775 (square meter)

Question 9: Bottom area: 3. 14* 15? =7.065 square meters

Transverse area: 3. 14*3*2= 18.84 (m2)

Question 10: bottom area: 3. 14*4? *2= 100.48 (square centimeter)

Side area: 3. 14*8* 13=326.56 (square centimeter)

326.56+ 100.48=427.04 (square centimeter)

Question 13: The surface area of the first rectangle: (10 *10 *10+15) * 2 = 800 (square centimeter).

Square surface area: 6*6*6=2 16 (square decimeter)

Surface area of cylinder: bottom area: 3. 14*5? *2= 157 (square centimeter)

Side area: 3.14 * 5 * 2 *12 = 376.8 (square centimeter).

376.8+ 157=533.8 (square centimeter)

Question 14: lateral area surface area under known conditions.

The bottom surface is 24 cm in diameter and 8 cm in height, 602.88 cm2,1507.2cm2..

The perimeter of the bottom is 3. 14m, and the height is 5m, 15.7m2,17.27m2. ..

The bottom radius is 2.5 decimeters, and the height is 4 decimeters 62.8 square decimeters 102.05 square decimeters.

-

Should be correct, dare not say absolutely, but most of them are right. I hope I can help you. I am an angel baby.

Please don't copy! ! !