- Books Name
- CBSE Class 6 Mathematics Book
- Param Publication
- CBSE Class 6
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”.