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How to solve cuboid questions?

If we have to find solution of questions related to cuboid, We have to learn the following formals:
If length = l, height = h and breath = b. Then,
(i) Volume = (l x b x h) cubic units
(ii) Surface area = 2 (lb + bh + lh) sq. units
(iii) Diagonal = √ l^2 + b^2 + h^2We have following examples to practice with:1. Find the volume of a cuboid of length 25 cm, breadth 20 cm and height 15 cm.Solution: Length of the cuboid = 25 cm
Breadth of the cuboid = 20 cm
Height of the cuboid = 15 cm
Therefore, volume of the cuboid = length × breadth × height
= (25 × 20 × 15) cm³ = 7500 cm³2. If the volume of a room is 396 m³ and the area of the floor is 66 m², find the height of the room.Solution:
Volume of the room = 396 m³
Area of the floor (l × b) = 66 m²
Therefore, height of the room = (Volume of the room)/(area of the floor)
= 396 m³/ 66 m² = 6m3. Find the length of the longest pole that can be placed in a room 12m long, 8m broad and 9m High.Solution: We have length, breadth and height. We have …