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  1. A square of side 3 cm is cut off from each corner of a rectangular sheet of length 24 cm and breadth 18 cm and the remaining sheet is folded to form an open rectangular box. The surface area of the box is
    1. 468 cm²
    2. 396 cm²
    3. 612 cm²
    4. 423 cm²
Correct Option: B


Length of box = 24 –( 2 × 3) = 18 cm
Width of box = 18 – 2 × 3 = 12 cm
Height of box = 3 cm
∴ Surface area of box = 18 × 12 + 2 (12 × 3 + 3 × 18)
= 216 + 180 = 396 sq. cm



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