Question

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Find the surface area of cuboid.​

Answer 1

Step-by-step explanation:

ANSWER IS 768 cu.cm

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Answer 2

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Given :

$length \: = 5 \frac{1}{2} = \frac{11}{2} cm \\ breadth \: = 4cm \\ height \: = 10 \frac{1}{2} = \frac{21}{2} cm$

Solution :

$Area \: of \: cuboid = 2(lb + bh + hl) \\ = 2( \frac{11}{2} \times 4 + 4 \times \frac{21}{2} + \frac{21}{2} \times \frac{11}{2} ) \\ = 2(22 + 42 + 57.75) \\ = 2(121.75) \\ = 243.5cm {}^{2}$

Area of cuboid = 243.5 cm²