videocam_off
This livestream is currently offline
Check back later when the stream goes live
Up next in 10
How to solve perimeter based problems for class 8 maths
Show More Show Less View Video Transcript
0:00
welcome students this video is about
0:02
menation problems for class 8 question
0:04
number one an ant is moving around a few
0:08
food pieces of different shapes
0:09
scattered on the floor for which food
0:12
piece would the ant have to take a
0:14
longer round remember circumference of
0:17
the circle can be obtained by using the
0:19
expression C= 2 pi R where R is the
0:23
radius of the circle in these type of
0:26
problems we need to count the length of
0:27
the shape so we need to look at the
0:29
parameter of the shape so now take a
0:31
look at the parameter of the shape for
0:33
the first case the parameter of shape
0:35
would consist of parameter of
0:36
semicircular part and diameter of the
0:39
part so parameter of semicircular part
0:42
is given by p r and diameter is
0:45
given by 2 r where r is the radius of
0:47
the circle so substituting the values of
0:51
pi and r here we get perimeter of the
0:54
first shape as 7.2 cm in the second case
0:58
the parameter of shape consist of three
1:00
things first the parimeter of
1:02
semic-ircular parts then we have two
1:04
length side here and then one bread side
1:07
so again substituting the value of those
1:10
uh length breadth and radius we get
1:13
p r + 12 + b that is equal to 4.4 +
1:17
3 + 2.8 that is equal to 10.2 cm now
1:21
let's take a look at the third part the
1:23
parameter of the third shape consist of
1:25
parameter of the semicircular part plus
1:28
two slant heights so substituting those
1:30
values 4.4 + 4 is equal to 8.4 cm so
1:35
from the three numerical values we can
1:38
see that first shape the ant would have
1:42
to cover least distance and in the
1:44
second shape ant has to travel the
1:46
longest distance for more notes and
1:48
study material please visit our website
1:50
physicscatalyst.com
#Primary & Secondary Schooling (K-12)