Examples: Basics of geometry Video Lecture - Class 6

hello friends this video on basic
geometrical ideas part 7 is brought to
you by exam feel calm no more fear from
exam so with this we have covered the
basic geometrical objects that is point
line line segment and read we will
quickly look at some of the questions
just to ensure that the basics of
geometry are to your question number one
name the line given in all possible ways
that is 12 possibilities choosing only
two letters at a time from the forgiven
so what do you see on the screen on the
screen we see a line because we have
atoms on both ends which tells that it
extends indefinitely on both the
directions but we have certain fixed
points which has divided the line into
smaller line segments now what we need
to do is we need to name the line in all
possible ways so what are the different
ways by which we can name this line now
we already discussed that how do we
represent line we represent line with
two letters at a time now some of the
wheels by which we can name this line
are a B so a B could be one name it
could also be easy
it could be a D it could also be being
because though a B and be able to mean
the same thing but still that's a
different name altogether like how do
you have a name for your an official
name which is the name in your school
and another nickname which may be your
parents or your friends called you so in
a similar way a B and via these are two
different names even though they mean
the same thing similarly you can see a
similarly being in a similar way you can
also name it as b c BB c b b b you can
also name it as C D or D C so how many
did we get one two three four five six
seven eight nine ten
and twelve so these are the all twelve
possible ways by which this line can be
named question number two use the figure
to name line containing point e so where
do we have e this is e now which is the
line that contains e so if you look at
this point e it is present on this line
that is AE so AE is one line which
contains e is there any other line which
contains B yes EF is also a line which
contains the point E so any else is also
another time is there any other line no
line passing through a so where do you
have e this is e which line is passing
through point in again that is a line on
which old eyes so this is point O so
which is the line on which all lies this
is nothing but C o or o C whatever you
call it two pairs of intersecting lines
so where do you see intersecting lines
wherever two lines have a common point
so this is one line this is another line
at these two lines have a common point
here similarly this is one line this is
another line and these two lines have a
common point here so basically one pair
of intersecting lines would be AE and Co
the other pair of intersecting lines
would again be a E and F E or EF so
these are the two pairs of intersecting
lines question number three how many
ions can pass through one given point so
let us see this is one point and how
many lines can pass through this point
actually in finite let's say like this 1
2 3 4 5 say
seven and in finite number of lines can
pass through this point
so therefore in finite lines can pass
through one given point to two given
points to let's say you are given two
points like this so you have to draw a
line such that the line should pass
through this point as well as through
this point so how many lines can pass
through these two points now when we say
lines we generally referred the straight
lines we do not refer curves so that
that's what I was discussing beforehand
so whenever normally we could talk about
lines and talk about straight lines so
how many straight lines can pass through
these two points
only one you cannot have any more
straight line which can pass through
both of these points so if you say if
you try to draw a line like this it
doesn't pass through this point if you
try to draw a line like this again it
doesn't pass through this point so for a
line you pass through both of these
points there could be just one such line
question number four draw a rough figure
and label some degree in each of the
following cases point P lines on a B so
basically you draw a line a B so let us
call this as a line a B and point P lies
overhead so point P lies somewhere
between a B X Y and P P you intersect at
M so you have one line as X Y you have
another line as P Q and the question see
is that both of them intersect at M so
that means the point of intersection is
M line L contains E and F but not D so
let us first draw a line in
so let us call this as line N and this
line contains point E and F so G and F
are present of this line l but not B
that means D is present somewhere
outside whether here or here or anywhere
but not out the line both P and Q meet
at all so let us say this is OB uses O
and this is P and this is Q so Opie and
OQ meet at point O so by leading these
statements it was pretty easy or pretty
simple to draw these shapes thank you
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