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A straight line may be drawn from any one point to any other point.
The postulate says that a line passes through two point.
But, it does not say that
only one line passes through 2 distinct points
So, we make an axiom of it - Axiom 5.1
Terminated line means line segment can be extended from either
side to form a lines.
Here, Line AB can be extended from both sides
A circle can be drawn with any center and any radius
Eg: Circle of radius 1.5 cm & centre (0, 0)
Circle of radius 2 cm & centre (0, 0)
Circle of radius 1 cm & centre (1, 1)
All right angles are equal to one another .
Here, ∠ B = ∠ Q = 90°
If a straight line falling on two straight lines makes the interior
angles on the same side of it taken together less than two right angles, then the
two straight lines, if produced indefinitely, meet on that side on which the sum of
angles is less than two right
We discuss more about it in Ex 5.2, 1