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**Hint:**Quadrilaterals are one type of polygon that has four sides and four vertices and four angles along with 2 diagonals. There are various types of quadrilaterals. Trapezium, kite, square, etc.

Introduction of curves-

A curve is a geometrical figure obtained when a number of points are joined without lifting the pencil from the paper and without retracing any portion. It is basically a need which not to be straight.

The various types of curves are:

Open curve- An open curve is a curve in which there is no path from any of its point to the same point.

Closed curve- This is a curve that forms a path any of its point to the same point.

A curve can be

-a closed curve

-an open curve

-a closed curve which is not simple.

Therefore,

**Complete step by step answer:**

A closed curve whose endpoints join to enclose an area is called closed curves.

They all are known as a closed curve.

**Note:**In simple closed curves the shapes are closed by line segments or by a curved line.

There are three types of simple closed curves-

Some simple closed curves are made of line segments only. These curved are known as polygons, triangles, etc.

Some simple closed curves are made by curved lines only. A circle is an example of such a closed curve.

Some simple closed curves are made of both line segments and curved lines.

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