Question

A 20 cm long thread is used thrice to cover the whole boundary of an irregular figure. What is the perimeter?

• A. 50 cm
• B. 60 cm
• C. 40 cm
• D. 20 cm

Answer 1

The correct option is B 60 cm

Length of the thread = 20 cm

Since, it is used three times to cover the whole boundary, it means, the perimeter of the figure is three times the length of the thread.

So, perimeter = 3 × 20 cm
= 60 cm