Question

find the tsa and the LSA of a cuboid whose dimensions are l-20cm b-15cm h-8 cm​

Answer 1

Answer:

T.S.A=1160 cm² & L.S.A=560 cm²

Step-by-step explanation:

T.S.A of cuboid = 2(l×b+b×h+h×l)

=> 2(20×15+15×8+8×20)

= 2(300+120+160)

= 2(580)

= 1160 cm²

L.S.A of cuboid = 2(l+b)×h

=> 2(20+15)×8

= 2(35)×8

= 70×8

= 560 cm²

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Answer 2

Answer :-

• TSA of Cuboid = 1160 cm²
• LSA of Cuboid = 560 cm²

Given :-

• Length of Cuboid = 20 cm
• Breadth of Cuboid = 15 cm
• Height of Cuboid = 8 cm

To Find :-

• TSA of Cuboid = ?
• LSA of Cuboid = ?

Explanation :-

As we Know,

$\blue { \boxed { \bf \implies TSA \: of \: Cuboid = 2(LB + BH + HL) }}$

$\blue { \boxed { \bf \implies LSA \: of \: Cuboid = 2H(L+B) }}$

Now,Substituting the values

$\bf \odot \: For \: TSA \: of \: Cuboid$

$\rm : \: \longrightarrow 2(LB + BH + HL)$

$\rm : \: \longrightarrow 2[20(15) + 15(8) + 8(20)]$

$\rm : \: \longrightarrow 2[300 + 120 + 160]$

$\rm : \: \longrightarrow 2(580)$

$\red { \underline { \boxed { \bf : \: \longrightarrow 1160 \: cm^2 }}}$

$\bf \odot \: For \: LSA \: of \: Cuboid$

$\rm : \: \longrightarrow 2H(L + B)$

$\rm : \: \longrightarrow 2(8)[20 + 15]$

$\rm : \: \longrightarrow 16 (35)$

$\red { \underline { \boxed {\bf : \: \longrightarrow 560 \: cm^2 }}}$

Hence, the TSA and LSA of the cuboid are 1160 cm² and 560 cm² respectively.

@Agamsain