Question

Work out the surface area of the solid cuboid 2cm 5cm 8.1cm

Answer 1

Answer:

curved surface area of cuboid = 2(l+b)×h = 2(2+5)×8.1 = 2×7×8.1 = 113.4cm²

Answer 2

Answer :-

• The surface area of the cuboid is 133.4 cm³.

To find :-

• The surface area of the cuboid.  

Step-by-step explanation :-

• Here, the dimensions of the cuboid are given to us. We have to find it's surface area!

We know that :-

$\boxed{\sf{Surface \: Area_{(cuboid)} = 2\:(LB + BH + HL)}}$

Where,

• L = Length.

• B = Breadth.

• H = Height.

Here,

• Length = 2 cm.
• Breadth = 5 cm.
• Height = 8.1 cm.

Therefore,

 

$\sf{\longrightarrow \: Surface \: Area = 2\:(2 \times 5 + 5 \times 8.1 + 8.1 \times 2)}$

$\sf{\longrightarrow \: Surface \: Area = 2\:(10 + 5 \times 8.1 + 8.1 \times 2)}$

$\sf{\longrightarrow \: Surface \: Area = 2\:(10 + 40.5 + 8.1 \times 2)}$

$\sf{\longrightarrow \: Surface \: Area = 2\:(10 + 40.5 + 16.2)}$

$\sf{\longrightarrow \: Surface \: Area = 2\:(66.7)}$

$\sf{\longrightarrow \: Surface \: Area = 2 \times 66.7}$

$\sf{\longrightarrow \: Surface \: Area = 133.4 \: cm^3}$

Hence,

• The surface area of the cuboid = 133.4 cm³.

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