Question

What is the length of the thread required to form a regular octagon with each side length 10 cm?

• A. 40 cm
• B. 80 cm
• C. 120 cm
• D. 160 cm

Answer 1

The correct option is B 80 cm

The length of the thread required to form a regular octagon is equal to the perimeter of the octagon.

Since the octagon has 8 sides, and here each side is 10 cm long, the perimeter will be equal to $8\times 10=80cm$.

Hence the length of the thread is 80 cm.