Draw rough diagrams to illustrate the following:

(a)Open curve

(b)Closed curve

In simple closed curves the shapes are closed by line-segments or by a curved line. Triangle, quadrilateral, circle, etc., are examples of closed curves. The shape which is not closed by line-segments or a curve is called an open curve. A closed curve which does not cross itself is called a simple closed curve.
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I) closed curve ii) Open curve

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