When we have a line, we can mark a point on the line or not on it.

**Points
and lines**

When we have a line, we can mark a point on the
line or not on it.

‘A’ is on ‘** l_{1}**’,
‘B’ is not on ‘

What about 3 points and a line? Consider the following
lines ‘** l_{1}**’ ‘

When all the three points are on a line, they are
special; we call such points as collinear points.

When two lines intersect at right angles (90°),
we call them as perpendicular lines. (Refer to 4.31)

**Activity**

A book is an object where you can
see parallel, perpendicular and intersecting lines.

Suggest atleast 2 more examples having
parallel, perpendicular and intersecting lines.

Two intersecting lines cut at a point. Will three
lines intersect at one point? Fig.4.32 will help you to answer this.

When many lines intersect at a single point, that
is again special, we call that point P as a point of concurrency. The lines are
called concurrent lines.

Tags : Geometry | Term 1 Chapter 4 | 6th Maths , 6th Maths : Term 1 Unit 4 : Geometry

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6th Maths : Term 1 Unit 4 : Geometry : Points and lines | Geometry | Term 1 Chapter 4 | 6th Maths

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