Solution: From the meaning of the question, we can know that the biscuit is a cuboid. Calculating the area of the surrounding stickers is to calculate the surface area of the cuboid.

According to the formula of cuboid surface area, table S =2x (length× width+length× height+width× height).

= 2x(20x 15+20x 10+ 15x 10)

=2x(300+200+ 150)

=2x650

= 1300 cm2

That is, the area of this trademark paper is 1300 square centimeter.

Extended data:

1, characteristics of cuboids

(1) A cuboid has six faces. The reverse sides of each group are exactly the same.

(2) A cuboid has 12 sides, and four opposite sides are equal in length. According to the length, it can be divided into three groups, each group has four sides.

(3) A cuboid has eight vertices. Each vertex connects three edges. The three edges of a cuboid are called length, width and height.

(4) Two adjacent sides of a cuboid are perpendicular to each other.

2. Calculation formula of cuboid

(1) surface area

Let the length, width and height of a cuboid be A, B and C respectively, then its surface area is S = (ab+bc+ca)×2, which is also equal to

2ab+2bc+2ca is also equal to 2(ab+bc+ca).

(2) volume

Cuboid volume = length× width× height. Let the length, width and height of a cuboid be a, b and c respectively, and the volume V=abc.

Baidu encyclopedia-cuboid