10cm =0. 1 m
The surface area of the carton is 0.1× 0./kloc-0 /× 6 = 0.06m2..
Can do it: 3÷0.06=50.
The shape and size of the stage platform are shown below. Paint all sides (bottom unpainted). What is the area of the painting?
Coloring area = the area of five faces of a cuboid with a width of 6 decimeters, a height of 6 decimeters and a length of 40 decimeters, that is, the areas of two squares with a side length of 3 decimeters.
=6×40+(60×40+6×6)×2-3×3×2
=240+4872- 18
=5094 square decimeter