Points, Lines and Shapes
Definition
of points, lines and shapes in geometry:
Point: A point is the fundamental element of geometry. If we put the tip of a pencil on a paper and press it lightly, we see a very small mark on the paper. This mark is known as a point.
The smallest mark denotes the existence of a point. We say that a point does not have any length, breadth or thickness, but it has a definite position.
It can be named by a capital letter of the English alphabet like A, B, C, ……. etc.
In short, we can make a small dot on a paper by using a sharp pencil
or a tip of the needle. It is called a point. It represents a position and is
marked by a capital letter A, B, C etc. A point has no size or shape. So, on a
line an infinite number of points exist.
Line: If two points
are made at a distance on a surface and are joined by a pencil then a part of a
line is formed. The part of the line will be straight if the surface is plane
and curved if the surface is curved.
Thus, if we join any two points with a ruler and extend it
on both sides, a line is formed.
A line is indicated by drawing arrowheads on both sides of
the part of a line.
The arrowheads at the ends indicate that the line goes on
in both directions. A line has no end, so it has not a definite length.
The name of a line is indicated by two capital letters of
the English alphabet.
The symbol ↔ is placed over the letters as AB, CD.
These explanations on points, lines and shapes will help the
kids to understand the different fundamental element of geometry and how they
are indicated.
In short, a line is a straight path of points. A line has no beginning
or end. A line is named by a single small letter l, m, n, etc. A line is also
represented as \(\underset{AB}{\leftrightarrow}\). A line can be straight or curved.
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Related
Concepts
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Basic Shapes
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Surfaces of the
Solids
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Common Solid Figures
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LineSegment, Ray
and Line
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Types of Lines
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Geometrical Design
and Models
3rd Grade Math Lessons
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