Question

1. Three cubes are joined end to end forming a cuboid.If side of of cube is 3cm then total
surface area of resulting cuboid is
a) 180 cm2
b) 163 cm?
c) 126 cm2
d) 243 cm?
10 om in Bocm2 find the diameter of the​

Answer 1

Answer:

option c is   the correct answer

Step-by-step explanation:

now, sides of the cuboid is

l= 9 cm

b=3cm

h=3cm

surface area=2(lb+bh+hl)

=2(9×3+3×3+9×3)

=2(27+9+27)

=2×63

=126centimetre square

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Answer 2

Given :

• Three cubes of side 3 cm are joined end to end .

To Find :

• Total Surface Area of Resulting Cuboid .

Solution :

When three cubes are joined end to end . Then ,

• Length = 3+3+3 = 9 cm .
• Breadth = 3 cm .
• Height = 3 cm .

Using Formula :

$\longmapsto\tt\boxed{T.S.A\:of\:Cuboid=2(lb+bh+hl)}$

Putting Values :

$\longmapsto\tt{2(9\times{3}+3\times{3}+3\times{9)}}$

$\longmapsto\tt{2(27+9+27)}$

$\longmapsto\tt{2(54+9)}$

$\longmapsto\tt{2(63)}$

$\longmapsto\tt\bf{126\:{cm}^{2}}$

So , The Total Surface Area of Cuboid is 126 cm² .

Option c) 126 cm² is Correct .

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• L.S.A of Cuboid = 2h (l+b)
• T.S.A of Cuboid = 2(lb+bh+hl)
• Volume of Cuboid = l×b×h
• L.S.A of Cube = 4a² (a = side)
• T.S.A of Cube = 6a²
• Volume of Cube = a³

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