How to find the surface area of matchbox

Students, look, what is Teacher Chen's hand? At the same time, from a mathematical point of view, what mathematical knowledge can you relate to what we have learned these days?

Health: The shape of a matchbox is a cuboid.

(If a student suggests that a cuboid has 6 faces, 12 sides and 8 vertices. 4 long, 4 wide and 4 high. To sum up, this is the characteristic of cuboids. )

Teacher: What else can you find?

Health: You can also calculate the surface area of the matchbox.

1, pointing to the big screen, said: Will the surface area of this matchbox be required?

Show me the letters and tell me how to calculate the surface area of this matchbox.

Blackboard: s table =2(ab+ah+bh)