The surface area of ??this tea box is 602.88 square centimeters.

This question examines the method of calculating surface area. The specific solution ideas are as follows:

1. Surface area of ??cylinder: side area and base area × 2

2. ?This tea leaf The surface area of ??the box is equal to the area of ??a circle plus two side areas. The side area is equal to the base multiplied by the height. As shown in the figure below, 25.12 is the circumference of the base circle. According to the circumference formula of a circle, the radius of the base circle can be found, and then the circle is calculated. area.

3. Calculation formula: 25.12×20=502.4 (square centimeters)

(25.12÷3.14÷2)?×3.14×2

=50.24× 2

=100.48 (square centimeters)

502.4 100.48=602.88 (square centimeters)

So the surface area of ??this tea box is 602.88 square centimeters.

Extended information

Calculation method of cylinder surface area:

1. The two circular surfaces of the cylinder are called the base, and the surrounding surfaces are called the sides. A cylinder It is composed of two bases and one side.

2. The two bottom surfaces of the cylinder are exactly the same two circular surfaces. The distance between the two bases is the height of the cylinder.

3. The side of the cylinder is a curved surface, and the expanded view of the side of the cylinder is a rectangle, square or parallelogram (cut obliquely).

4. Side area of ??cylinder = base perimeter =πd

?Surface area of ??cylinder = side area base area x2=Ch 2πr^2=2πr (r h)

Baidu Encyclopedia - Cylinder