9.A CURVE IS SAID
TO BE CLOSED IF ITS ENDS ARE JOINED OTHERWISE IT IS SAID TO OPEN TO BE OPEN
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Answer: Any drawing (straight or non-straight) done without lifting the pencil may be called a curve. In this sense, a line is also a curve. A simple curve is one that does not cross itself. A curve is said to be closed if its ends are joined; otherwise it is said to be open.
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