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Volumes Practice Test 4

Question : 4 of 16

Marks: +1, -0

Solution:

Concept:

When cubes are joined end to end, they form a cuboid, so use the cuboid surface area formula.

Explanation:

Each cube has edge

10\ \mathrm{cm}

Six cubes joined end to end give length

= 6 \times 10 = 60\ \mathrm{cm}

Breadth

= 10\ \mathrm{cm}

and height

= 10\ \mathrm{cm}

Surface area of cuboid

= 2(lb + bh + hl)

So,

= 2(60 \times 10 + 10 \times 10 + 10 \times 60)

= 2(600 + 100 + 600)

= 2 \times 1300 = 2600\ \mathrm{cm}^2

Answer:

The surface area of the resulting solid is

2600\ \mathrm{cm}^2

, so option B is correct.

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