Question : The diagonal of a cuboid of length 5 cm, width 4 cm, and height 3 cm is:
Option 1: $5\sqrt2$ cm
Option 2: $2\sqrt5$ cm
Option 3: $12$ cm
Option 4: $10$ cm
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Correct Answer: $5\sqrt2$ cm
Solution : Given: Length ($l$) = 5 cm Width ($b$) = 4 cm Height ($h$) = 3 cm Diagonal of a cuboid = $\sqrt{l^2+b^2+h^2}$ $=\sqrt{5^2+4^2+3^2}$ $=\sqrt{25+16+9}$ $=\sqrt{50}$ $=5\sqrt2$ cm Hence, the correct answer is $5\sqrt2$ cm.
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