Question

Find L.S.A and T.S.A of cuboid whose length is 20cm,breath is 15cm,height is 10cm.

Answer 1

answer is mentioned above

Answer 2

$\blue{\bold{\underline{\underline{Answer:}}}}$

$\green{\therefore{\text{T.S.A\:of\:cuboid=1300\:cm}^{2}}}$

$\green{\therefore{\text{L.S.A\:of\:cuboid=700\:cm}^{2}}}$

$\orange{\bold{\underline{\underline{Step-by-step\:explanation:}}}}$

$\green{ \underline \bold{given : }} \\ : \implies \text{Length(l) = 20\: cm} \\ \\ : \implies \text{Breadth(b) = 15\: cm} \\ \\ : \implies \text{Height(h) = 10\: cm} \\ \\ \red{ \underline \bold{to \: find : }} \\ : \implies \text{T.S.A \: of \: cuboid = ? }\\\\ :\implies \text{L.S.A\:of\:cuboid=?}$

• According to given question :

$\bold{As \: we \: know \: that} \\ : \implies \text{T.S.A \: of \: cuboid} = 2(lb + bh + hl) \\ \\ : \implies \text{T.S.A \: of \: cuboid} = 2(20 \times 15 + 15 \times 10 + 10 \times 20) \\ \\ : \implies \text{T.S.A \: of \: cuboid} = 2(300 + 150 + 200) \\ \\ : \implies \text{T.S.A \: of \: cuboid} = 2 \times 650 \\ \\ \green{: \implies \text{T.S.A \: of \: cuboid = 1300 \:{cm}}^{2} }$

$\bold{As \: we \: know \: that} \\ : \implies \text{L.S.A \: of \: cuboid} = 2(l+b)\times h\\ \\ : \implies \text{L.S.A \: of \: cuboid} = 2(20+15)\times 10 \\ \\ : \implies \text{T.S.A \: of \: cuboid} = 2\times 35\times 10\\ \\ : \implies \text{L.S.A \: of \: cuboid} = 70 \times 10 \\ \\ \green{: \implies \text{L.S.A \: of \: cuboid = 700 \:{cm}}^{2} }$