Q.

Which of the following is a simple closed curve?

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a

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b

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c

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d

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answer is A.

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Detailed Solution

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If a curve does not cross itself while changing directions, then it is called a simple closed curve. 

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        This is a simple closed curve.

 

 

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 This is a non-simple closed curve as it crosses itself.

 

 

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         This is an open curve.

 

 

 

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   This is an open curve (line segment).

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Which of the following is a simple closed curve?