Answer:
232cm
Explanation:
A cheese usually has the shape of a cuboid.
Characteristics of a Cuboid 
- A cuboid is a convex polyhedron
 - It has 12 edges
 - It has 8 faces
 - Its base shape is a rectangle
 - It has 6 faces 
 
The amount of paper that would be needed to cover the block of cheese can be determined by calculating the perimeter of the block of cheese which is shaped as a cuboid 
Perimeter of a cuboid = 4 x (length + breadth + height) 
4 x (30 + 20 + 8) = 232cm