7. Find the lateral surface area, total surface area and volume of cuboid whose dimensions are I=20 cm, b=8 cm and h=6 cm.
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Answer:It is given that length =12 cm, breadth 8 cm and height =4.5cm
We know that
Volume of cuboid =l×b×h
The volume of cuboid =12×8×4.5
The volume of cuboid =432 cm
We know that
Lateral surface of a cuboid =2(l+b)×h
The lateral surface area of a cuboid =2(12+8)×4.5
The lateral surface area of a cuboid =2×20×4.
The lateral surface area of a cuboid =180cm
We know that
The total surface area of cuboid =(Ib+bh+Ih)
The total surface area of cuboid =2(12××8+8×4.5+12×4.5)
The total surface area of cuboid =2(96+36+54)
The total surface area of cuboid =2×186
Total surface area of cuboid =372 cm 2
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