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Find the surface area of the cuboid.

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300.1 {mm}^{2}

320.5 {mm}^{2}

316.4 {mm}^{2}

305.2 {mm}^{2}

answer is C.

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Detailed Solution

The given cuboid is,
Question Image

The dimensions of a cuboid are as follows:
Length (l)

= 14 mm

, breadth (b)

= 8 mm

, height (h)

= 2.1 mm

.
We have to find the surface area of the cuboid.
Surface area of a cuboid = 2 (length × breadth + length × height + breadth × height)

\Rightarrow S = 2 \times (14 \times 8 + 8 \times 2.1 + 2.1 \times 14)

\Rightarrow S = 2 \times (112 + 16.8 + 29.4)

\Rightarrow S = 2 \times 158.2

\Rightarrow S = 316.4

{mm}^{2}

Therefore the surface area of the cuboid

= 316.4

{mm}^{2}

.
Hence, option 3 is correct.

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