Question

Find the lateral surface area and total surface area of a cuboid whose length,breadth and height are 20cm, 10cm and 40cm respectively.

Note : please give the answer with steps.

Answer 1

LSA OF CUBOID =2(l+b)h
2(20+10)40
=2400squnits
TSA OF CUBOID =2(lb+bh+lh)
2(20×10+10×40+40×20)
=2800squnits

Answer 2

Total surface area=2(lb+bh+hl)
2×(20×10+10×40+40×20)
2×(200+400+800)
2×1400
Total surface area=2800cm sq.
Lateral surface area=2×(bh+hl)+lb
2×(10×40+40×20)+20×10
2×(400+800)+200
2×1200+200
2400+200=2600
Lateral surface area=2600cm sq.