Question

Find the total surface area of the cuboids of length, breadth and height as given below
(i) 12 cm. 10 cm, 5 cm
(ii) 5 cm, 3.5 cm, 1.4 cm
(iii) 2.5 cm, 2 m. 2.4 m
(iv) 8 m, 5 m, 3.5 m​

Answer 1

Answer:

Here's your answer

Lateral surface area of a cuboid = 2 × height × (length + breadth). Total surface area of a cuboid = 2(lb + bh + hl).

Explanation:

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Answer 2

Answer:

(1) length =12 cm breadth =10 cm  height =5 cm

TSA=2(lb+bh+lh)=2[12×10+10×5+5×12]

TSA=2[120+50+60]=2×230

[TSA=460cm  

2

]

(2) length =5 cm   breadth =3.5 cm   height =1.4 cm

TSA=2(lb+bh+lh)=2[5×3.5+3.5×14+1.4×5]

TSA=2[17.5+4.90+7.0]=2[29.4]

[TSA=58.8cm  

2

]

(3) length =2.5 cm   breadth =2 m   height =2.4 m

TSA=2(lb+bh+lh)=2[0.025×2+2×2.4+2.4×0.025]

TSA=2[0.05+4.8+0.0600]=2[4.91]

(4) length =8 m   breadth =5 m    height =3.5 m

TSA=2(lb+bh+lh)=2[8×5+5×3.5+3.5×8]

TSA=2[40+17.5+28.0]=2[85.5]

[TSA=171.0m  

2

]

Explanation:

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