Solution:

`"Here, we have " l = 3, b=4, h=5" (Given)"`
`"Diagonal"^2 = l^2 + b^2 + h^2`
`"Diagonal"^2 = 3^2 + 4^2 + 5^2`
`"Diagonal"^2 = 50`
`Diagonal = 7.0711`
`"Here, we have " l = 3, b=4, h=5" (Given)"`
`"Volume" = l * b * h`
` = 3 * 4 * 5`
` = 60`
`"Here, we have " l = 3, b=4, h=5" (Given)"`
`"Total Surface Area" = 2 (lb + bh + lh)`
` = 2 * (3 * 4 + 4 * 5 + 3 * 5)`
` = 2 * (47)`
` = 94`
`"Here, we have " l = 3, b=4, h=5" (Given)"`
`"Curved Surface Area" = 2h (l + b)`
` = 2 * 5 (3 + 4)`
` = 70`


