Calculate the area of the blue surface in ${cm}^{2}$ .

36

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Solution

The correct option is A 36
The shaded portion can be split into two rectangles as shown:

The bigger rectangle has an area of:
$A_{1} = 4 c m \times 7 c m$
$A_{1} = 28 c m^{2}$

The smaller rectangle has an area of :
$A_{2} = 4 c m \times 2 c m$
$A_{2} = 8 c m^{2}$

The total area of the shaded portion is the sum of above two areas:
$A = 28 c m^{2} + 8 c m^{2} = 36 c m^{2}$

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