Question

E length, breadth and height of a room are 12 m, 10 m,
and 9m respectively. find the total surface area of the
room?
a) 636 m2
b) 516 m2
c) 800 m2
d) 456m2

Answer 1

Answer:

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Answer 2

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✤ Correct Question:

The length, breadth and height of a room are 12 m, 10 m, and 9m respectively. Find the total surface area of the room?

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✤ Required Answer:

✒ GiveN:

• Length = 12 m
• Breadth = 10 m
• Height = 9 m

✒ To FinD:

• Total surface area of the room...?

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✤ How to solve?

Let's first know What is Total surface area of any 3-D figure like cube, cuboid etc...?

• Total surface area means the area of all the faces and exposed area of the solid. For a rectangle, the sum total of area of all 6 faces gives Total surface area of cuboid.

For a cuboid, Formula for TSA of cuboid:

$\large{ \boxed{ \rm{TSA \: of \: cuboid = 2(lb + bh + hl)}}}$

So, By using this formula let's solve the above question. It's quite simple, just put the values and get the answer.

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✤ Solution:

We have,

• l = 12 m
• b = 10 m
• h = 9 m

So, by using formula,

➙ TSA = 2(lb + bh + hl) cm²

➙ TSA = 2(12×10 + 10×9 + 9×12) cm²

➙ TSA = 2(120 + 90 + 108) cm²

➙ TSA = 2(318) cm²

➙ TSA = 636 cm²

✒ Therefore, TSA of cuboid = 636 cm²(A)

☀️ Hence, solved !!

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