5. A tank is 20 m by 15 m by 2.5 m. Find its capacity in litres if 100 cu. cm = 1 litre.
6. Find the volume of a box with dimensions 12 cm, 8.25 cm and 4.5 cm.
Answers
Answer:
5. Volume of cuboid=l×b×h
=20×15×2.5
=750 cubic cm
100cubic cm=1 litre
750cubic cm=(?)
750×1/100=7.5 litre
6. volume of cuboid=l×b×h
=12×4.5×8.25
=445.5 cubic cm
It is given that length =12 cm, breadth 8 cm and height =4.5cm
We know that
Volume of cuboid =1×b×h
By substituting the value we get
Volume of cuboid =12×8×4.5
By multiplication
Volume of cuboid =432 cm
3
We know that
Lateral surface of a cuboid =2(1+b)×h
By substituting the values
Lateral surface area of a cuboid =2(12+8)×4.5
On further calculation
Lateral surface area of a cuboid =2×20×4.5
By multiplication
Lateral surface area of a cuboid =180cm
2
We know that
Total surface area of cuboid =(Ib+bh+Ih)
By substituting the value
Total surface area of cuboid =2(12××8+8×4.5+12×4.5)
On further calculation
Total surface area of cuboid =2(96+36+54)
So we get
Total surface area of cuboid =2×186
By multiplication
Total surface area of cuboid =372 cm
2