Chhattisgarh Board CHAPTER- 18 Perimeter class 5 maths | cg board class 5 maths perimeter

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Chhattisgarh Board CHAPTER- 18 Perimeter class 5 maths | cg board class 5 maths perimeter
In Deepa’s school the preparation for celebrating Republic day were going
on. To hang paper streamers, the children fixed four bamboo poles at the four ends
of the field and tied a rope to the first bamboo, tying it to the second, third and
fourth again tied it back to the first bamboo. Thus a rectangle of the rope was
formed.Now Deepa and her friends stuck the paper streamer and flags on this rope.
Deepa said “What is the length of this rope? Let us measure and see.”
Meeta got a meter scale from the teacher and started measuring the rope. To
do this they started from the first bamboo went to the second, third and fourth
bamboo and came back to the first-one. The measurement was 70 meters.
Just then the teacher reached there and asked what they were doing?
Deepa - We wanted to know the length of the rope. We measured it and found it
is 70 meters long.
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Teacher - How did you find this?
Meeta - We went from the first bamboo, to the second, third, fourth and again
to the first and found it was 70 meters long.
Deepa - This means the rectangle made by the rope has a perimeter of 70 meters.
Teacher - Yes, you are absolutely right.
“You know that the measure of the length of the boundary of a figure is called its
perimeter.”
Some figures are drawn below. Place your finger at any one place and start
tracing the figure.
Figure in which you reach the same point where you started from are
called closed figures
Figures in which you do not reach the same point you started from are
called open figures.
When Deepa and her friends were finding the perimeter of the rectangle formed
by the rope, did they reach the same point where they started from?
So what sort of figure is a rectangle? Open or closed?
We can find the perimeter of only closed figures.
To find the perimeter of the blackboard, table or book, you must have
measured all the four edges. Similarly to find perimeter of any closed figure we find
the length of the edges.\nLook at some of the objects around you like the blackboard, books etc
carefully write the names of the objects which you find to be closed figures of the
in the table below. Find the perimeter of the closed figures.
Meaning of perimeter - The total of the length of the sides of any closed figure.
Perimeter of Triangle -
Perimeter of ABC = ......... Perimeter of DEF = ......... Perimeter of XYZ = .........
What did you do to find perimeter of these triangles?
The perimeter of a triangle = length of first side + length of second side + length

third side
Perimeter of triangle = sum of the length of the three sides of a triangle.
Perimeter of a rectangle
What is the perimeter of the following rectanglesHow did you find the perimeter of these rectangles?
Some triangles are given below with the lengths of each side. Find the perimeter
of each triangle
1. The length of a playground is 200 metre and the breadth is 150 metre . If Raju
wants to go around the boundary once, how many metres would he have to
run?
2. A square garden has a side of 250 metres. To put a wire fencing around this,
what is the length of wire required?
162
Maths - 5
3. What is the length of lace which would be required to be put around a
handkerchief, which is a square with a side of 15 cm each?
If you wanted to make 5 such handkerchiefs what length of lace would you
need?
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