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.

The curve which crosses itself is not a simple closed curve.

Here is a collection of closed curves. Except curve **(d)** and **(e)**, the remaining shapes are simple closed curves.

There are three types of simple closed curves.

**(i)** Some simple closed curves are made of line-segments only. These curves are known as **polygons. Triangle, quadrilateral, pentagon** etc., are polygons.

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

**(iii)** Some simple closed curves are made of both line-segments and curved lines.

**Related Concepts on ****Geometry - Simple Shapes & Circle**

● Polygon

● Angle

● Triangle

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