(3) Bottom circumference: 10x3.14=31.4 (cm) Trademark paper side area: (31.4-1)x10=304 (square centimeters)

Answer: This one The area of ??the trademark paper is 304 square centimeters.

(4) Side area: 12.56x3=37.68 (square decimeters) Bottom radius: 12.56÷3.14÷2=2 (decimeters)

< p> Base area: 2x2x3.14=12.56 (square decimeters) Surface area: 12.56x2+37.68=62.8 (square decimeters)

Answer: Its surface area is 62.8 square decimeters.

(5) Side area: 2.8 decimeters=28 centimeters 28x62.8=1758.4 (square centimeters)

Bottom radius: 62.8÷3.14÷2=10 (cm) Bottom area : 10x10x3.14=314 (square centimeters)

Surface area: 1758.4+314=2072.4≈2080 (square centimeters)

Answer: A *** requires 2080 square centimeters of fabric.

20 minutes of blood and sweat! In question 3, I object to the statement "black and black". "3.14×5×5×10=785" is the volume of the cylinder!

Please adopt!