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Question

What length of ribbon is required to cover the two borders of the image shown below?

A
28 cm
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B
20 cm
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C
25 cm
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D
16 cm
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Solution

The correct option is A 28 cm
It is clear from the question that ribbon is required to cover the two borders / boundaries of the given figure.
So, we just have to calculate the perimeter of the outer and inner boundaries.


Perimeter of the outer boundary
= 4 cm + 4 cm + 4 cm + 4 cm
= 4 × 4 cm = 16 cm

Perimeter of the inner boundary
= 3 cm + 3 cm + 3 cm + 3 cm
= 4 × 3 cm = 12 cm

Total length of ribbon required = Perimeter of the outer boundary + Perimeter of the inner boundary
= 16 cm + 12 cm = 28 cm

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