Question

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

• A. 28 cm
• B. 20 cm
• C. 25 cm
• D. 16 cm

Answer 1

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

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