Axiom : If a line does not lie in a plane but intersects
it, their intersection is a point (figure 1.7 ).
Figure 1.6
Point A is the intersection point of line l and plane P.
Example 1
Take any three noncollinear points A,B and C on a paper. How many different lines can be drawn through different pairs of points ? Name the lines.
Solution :
Three lines can drawn namely AB, BC & AC.
Example 2
Figure 1.7
From figure 1.7 answer the following :

Name lines parallel to line AB
Are line AO and point R coplanar ? Why ?
Are points A, S, B and R coplanar ? Why ?
Name three planes passing through at A.
Solution :

Line CD, line SR and line PQ.
Yes. Any line and a point outside it are coplanar.
Yes. Two parallel line are always coplanar.
ABCD , ADSP and ADCB.

Index
Introduction
1.1 Points, Lines and Planes
1.2 Line Segment
1.3 Rays and Angles
1.4 Some Special Angles
1.5 Angles made by a Transversal
1.6 Transversal Across Two Parallel Lines
1.7 Conditions for Parallelism
Chapter 2
