- Books Name
- CBSE Class 6 Mathematics Book

- Publication
- Param Publication

- Course
- CBSE Class 6

- Subject
- Mathmatics

**Curves**

When we draw lines on a piece of paper without lifting the pencil and without using a scale, the shapes that we get are called curves.

Simple Curve : A curve that does not cross itself is called a simple curve. The figures shown below are simple curves.

**Open Curves : **The figures that do not begin and end at the same point are called open curves.

**Closed Curves :** The figures that begin and end at the same point are called closed curves.

For example : triangle, circle, rectangle, square, etc. are all closed figures.

**Position in a figure **

In a closed curve, thus, there are three parts.

**(i)** interior (‘inside’) of the curve

** (ii) ** boundary (‘on’) of the curve and

** (iii) ** exterior (‘outside’) of the curve.

In the figure, A is in the interior, C is in the exterior and B is on the curve.

The interior of a curve together with its boundary is called its **“region”.**