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