Question

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Answer 1

Step-by-step explanation:

(a)

$area \: of \: rectangle = l \times b \\ = 12 \times 20 \\ = {240cm}^{2}$

(b)

length of blue coloured rectangle is,

$= 20 - 2 - 2 \\ = 20 - 4 \\ = 16cm$

(c)

breadth of blue coloured rectangle is,

$= 12 - 2 - 2 \\ = 12 - 4 \\ = 8cm$

(d)

$area \: of \: rectangle = l \times b \\ = 16 \times 8 \\ = {128cm}^{2}$

(e)

area of green coloured strip = area of birthday card - area of blue rectangle

$= 240 - 128 \\ = {112cm}^{2}$