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A postage stamp is $12 mm$ in breadth and $20 mm$ in length. Find the area of stamp in $c m^{2}$ .

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0.24

c m^{2}

240

c m^{2}

24

c m^{2}

2.4

c m^{2}

answer is D.

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Detailed Solution

It is given length and breadth of a stamp is

20 mm

and

12 mm

respectively.
As we know that,

1 cm = 10 mm

.
So,

1 mm = 0.1 cm

.
Length

= 20 mm

\Rightarrow

Length

= 20 \times 0.1 cm

\Rightarrow Length = 2 cm

Breadth

= 12 mm

\Rightarrow

Breadth

= 12 \times 0.1 cm

\Rightarrow

Breadth

= 1.2 cm

Area of stamp

=

Length

\times

Breadth

\Rightarrow Area = 2 \times 1.2

\Rightarrow Area = 2.4 c m^{2}

So, area of stamp is

2.4 c m^{2}

.
Hence, option

4

is correct.

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A postage stamp is 12 mm in breadth and 20 mm in length. Find the area of stamp in cm2.

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A postage stamp is $12 mm$ in breadth and $20 mm$ in length. Find the area of stamp in $c m^{2}$ .