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

50 cm

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60 cm

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40 cm

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20 cm

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Solution

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

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