Answer :

Total surface area of a cuboid = 2[(Length ×Breadth) + (Breadth ×Height) + (Height ×Length)]


Total surface area = 2[(40×30) + (30×20) + (20×40)] cm2 = 2(1200+600+800) cm2


= 2(2600) cm2 =5200 cm2


Lateral surface area of a cuboid = 2(Length +Breadth) ×Height


Lateral surface area = 2(40+30) × 20 cm2 = 140× 20 cm2


= 2800 cm2


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