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Maths CBSE Live product
Class 9
Introduction to Euclid's Geometry
Euclid's axioms & postulates
3.
TBQ - Give the definitions
Question:
5
m.
Give a definition for each of the following terms. Are there other terms that need to be defined first? What are they, and how might you define them?
(i)
parallel lines:
The lines which never intersect each other are called parallel lines.
The lines which intersect exactly at one point are called parallel lines.
(ii)
perpendicular lines:
If two lines intersect each other at 180 degree then these are called perpendicular lines.
If two lines intersect each other at 90 degree then these are called perpendicular lines.
(iii)
line segment
A straight line drawn from any point to two other points is called as line segment.
A straight line drawn from any point to any other point is called as line segment.
(iv)
radius of a circle
It is the distance between the any two point lying on the circle.
It is the distance between the centre of a circle to any point lying on the circle.
(v)
square
A square is a quadrilateral having all sides of equal length and all angles of same measure.
A square is a quadrilateral having all sides of equal length.
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