Chap 8 Basic Geometrical Concept

Chap  8

Basic Geometrical Concept

Some Important facts:

1.    A point has an exact position. A point has no length and breadth.

2.    Line extends endlessly in both the directions.

                                                                                                L

3.    Plane is a  flat surface which extends infinitely in all directions.

4.    Through a given point in a plane, infinitely many lines can be drawn.

5.    We can draw only one line passing through two different points.

6.    If two lines intersect each other (or intersect on extending) then the lines are known as intersecting lines.

7.    If two lines do not intersect each other (as it is or after extending them in both directions) then the lines are known as parallel lines.

8.    In a plane three or more lines pass through the same point then the lines are known as concurrent lines. The point through which they pass is known as point of concurrence.

9.    Three or more than three points are known as collinear points if they lie on a straight line.

         L       .                 .                       .                      

                         A                    C                     B