Question

Find the lateral surface area of a cuboid whose length is 20cm, breadth is 8cm & height is 15cm.​

Answer 1

Step-by-step explanation:

Given that l=20cm, b=12cm, h=9cm

∴T.S.A=2(lb+bh+lh)

=2[(20×12)+(12×9)+(20×9)]

=2(240+108+180)

=2×528

∴T.S.A=1056cm 2

Answer 2

$\star\small\sf\underline\blue{Given:-}$

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• Length of cuboid is 20cm, Breadth of cuboid is 8cm and Height of cuboid is 15cm.

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$\star\small\sf\underline\blue{Find \: Out:-}$

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• The lateral surface area of a cuboid = ?

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$\star\small\sf\underline\blue{Solution:-}$

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$\footnotesize\bold{\underline{\underline{\sf{\red{Formula\: Used:-}}}}}$

${\underline{\boxed{\sf{Curved\: surface\:area = 2 \times (Length + Breadth) \times Height}}}}$

$\footnotesize\bold{\underline{\underline{\sf{\red{Putting\: the \:values:-}}}}}$

$\leadsto \sf \: L. S.A \:of\: cuboid = 2 \times 20 + 8 \times 15 \\ \\ \leadsto \sf \: L. S.A \:of\: cuboid = 2 \times 28 \times 15$

$\leadsto \sf \: L .S.A \:of\: cuboid = 2 \times 420 \\ \\ \leadsto \sf \: L. S.A \:of\: cuboid = 840 \:cm^2$

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$\star\small\sf\underline\blue{AnswEr:-}$

• The lateral surface area of a cuboid is 840 cm².