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A box is of 10 cm long, 8 cm broad and 5 cm high. What is the longest possible length of a pencil that can be put in?

Correct Answer: 3√21 cm

Explanation:

Since, the box is in the form of a cuboid.
∴ Required length = √102 +82 + 52 cm
= √189
= √9 x 21
= 3√21 cm


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