The cannery wants to make a cylindrical packaging box for canned fruits. It is known that the bottom radius of the can is 5CM and the height is 6CM. At the same time, a circle of business cards must be affixed to the outside of the box.

It takes 125.6 square centimeters of label paper to make a can, and 345.4 iron sheets to make a can?

The cylinder can be regarded as the upper and lower circles plus the rectangle in the middle

The area of ??the circle π*r*r=78.5CM2,: the cylinder has two circles 2π*r* r=157CM2; the circumference of the circle is 2π*r=31.4CM, which can be regarded as the length of the cylinder. Then the area of ??the iron piece (rectangle) in the middle of the cylinder is 2π*r*L=31.4*6=188.4CM2, then the cylindrical shape The area is 157+188.4=345.4CM2, that is, 345.4CM2 iron sheets are needed;

Trademark: The length of the iron sheet (rectangle) in the middle of the cylinder is 2π*r=31.4CM, which means that the length of the trademark is 31.4CM. Multiply the trademark height by 4, which equals 31.4*4=125.6CM2