The total surface area of a rectangular box of dimensions a- 2 a and Ba isA- 12 a 2B- 22 a 2C- 24 a 2D- 20 a 2

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Standard IX

Mathematics

Total Surface Area of a Cuboid

The total sur...

Question

The total surface area of a rectangular box of dimensions a, 2a and 3a is

20a²

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12a²

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22a²

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24a²

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Solution

The correct option is C
22a²

The total surface area of a cuboid.of dimensions l,b and h is

Total surface area=2(lb+bh+lh)

So, in this case, T.S.A.=2(2a²+6a²+3a²)=22a²

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Question 2

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The total surface area of a rectangular box of dimensions a, 2a and 3a is

The correct option is C 22a2The total surface area of a cuboid.of dimensions l,b and h is Total surface area=2(lb+bh+lh) So, in this case, T.S.A.=2(2a2+6a2+3a2)=22a2

The correct option is C
22a²

The total surface area of a cuboid.of dimensions l,b and h is

Total surface area=2(lb+bh+lh)

So, in this case, T.S.A.=2(2a²+6a²+3a²)=22a²