Question

find the Total surface area of length 80cm,breadth 40cm and height 20cm


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Answer 1

Answer: hope it's helpful!

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Step-by-step explanation:

LENGTH(l)=80 cm

BREADTH(b)=40 cm

HEIGHT(h)=20 cm

TSA OF CUBOID = 2(lb+bh+lh)

                            = 2[(80*40)+(40*20)+(20*80)] cm²

                            =2[3200+800+1600] cm²

                            =2[5600] cm²

                            =11200 cm²

LSA OF CUBOID=2(l+b)h

                           =2(80+40)20 cm²

                           =2(120)20 cm²

                           =40(120) cm²

                           =480 cm²

                           

Answer 2

$\sf\small\underline\red{Given:-}$

$\sf\rightarrow \: Length _{(l)} = 80 \: cm$

$\sf\rightarrow Breadth _{(b)} = 40 \: cm$

$\sf\rightarrow Height _{(h)} = 20 \: cm$

$\sf\small\underline\red{Find:-}$

• Find the total surface of area.

$\sf\small\underline\red{Solution:-}$

$\implies\sf TSA = 2(lb + bh + hl)$

$\sf = 2(80 \times 40 + 40 \times 20 + 80 \times 2)$

$= \sf1120 \: {cm}^{2}$

$\implies\sf LSA = 2(l + b)h$

$\sf = 20(80 + 40)20$

$\sf = 4800 {cm}^{2}$