Question

3.
Fig. 5.9
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?
parallel lines
(ii) perpendicular lines (iii) line segment
(iv) radius of a circle (v) square
Consider two postulates' given below:
(0) Given any two distinct points A and B, there exists a third point C which is in
between A and B.
(ii) There exist at least three points that are not on the same line.
Do these postulates contain any undefined terms? Are these postulates consistent
Do they follow from Euclid's postulates? Explain.​

Answer 1

Answer:

Parallel lines - 2 lines or rays that never intersect each other are said to be parallel lines.

Explanation:

Example - track of the railway

perpendicular lines - these are those that intersect each other and make 90° angle .

Radius of circle - a line segment joining the centre of the circle to any point on the circle is called radius of circle.

Line segment - a part of Line is called line segment.

Example - like in a line with 2end point like p,q