what is the difference between total surface area and curved surface area?

The curved surface area is the areas of the faces(flat or curved) of the solid. **Curved surface area of the solid does not include the area of the top and the area of the base of the solid.**

Curved surface area of the cuboid = 2*h*( *l* + *b*)

Curved surface area of the cylinder = 2 *rh*. ** This the area of the curved portion of the cylinder.**

**Total surface area of any solid is the sum of areas of all the faces(**flat or curved**) of the solid.**

Total surface area of the solid = Curved surface area of the solid + Surface area of the base + Surface area of the base

Total surface area of the cuboid = 2*h*( *l* + *b*) + 2 *lb = *2( *lh* + *bh + lb*) . **This the sum of the curved surface area and the areas of the top and base of the cuboid.**

Curved surface area of the cylinder = 2 *rh + * = 2 *r *( *r + h*). ** This is the sum of the curved portion and the areas of the top and base area of the cylinder.**

**
**