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प्रश्न
A matchbox is 4 cm long, 2.5 cm broad, and 1.5 cm in height. Its outer sides are to be covered exactly with craft paper. How much paper will be required to do so?
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उत्तर
Length of the matchbox, l = 4 cm
Breadth of the matchbox, b = 2.5 cm
Height of the matchbox, h = 1.5 cm
∴ Surface area of the box
= 2(l × b + b × h + h × l)
= 2(4 × 2.5 + 2.5 × 1.5 + 1.5 × 4)
= 2(10 + 3.75 + 6)
= 2 × 19.75
= 39.5 cm2
Hence, 39.5 cm2 of the craft paper will be needed to cover the matchbox.
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