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1. An open box is made by cutting the congruent squares from the corners of a rectangular sheet of cardboard of dimension 20 cm × 15 cm. If the side of each square is 2 cm, the total outer surface area of the box is :

Solution:
Clearly,
l = (20 - 4) cm = 16 cm
b = (15 - 4) cm = 11 cm and
h = 2 cm
∴ Outer surface area of the box :
=[2(l+b)×h]+lb=[{2(16+11)×2}+16×11]=(108+176)=284 cm2

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