Barbed wire is to be put around a rectangular flowerbed measuring 20m by 12m. if poles are erected after every one metre so that the barbed wire can put around it how many poles will be needed in all?
Answers
=2*(20+12)
=2*32=64m
barbed wire to be put out = 64m
1pole is for 1 meter
so,there will be 64 pole for 64 meters
Total 64 poles are required.
Given:
- Barbed wire is to be put around a rectangular flowerbed measuring 20m by 12m.
- if poles are erected after every one metre so that the barbed wire can put around.
To find:
- How many poles will be needed?
Solution:
Step 1:
Find the number of poles along length.
As length of flower bed is 20 m and poles are erected after every 1 meter.
So,
Along the one side of length of flowerbed,total 21 poles are to be erected.
*For the reference, see the attached image.
It is a rectangle of 4×3.
The points shown on the side AE are poles which are at 1 metre distance.
So, A,B,C,D,E ; i.e 5 poles on one side of length.
Thus,
Total 42 poles on the length of flowebed.
Step 2:
Find the number of poles along width.
As width of flower bed is 12 m and poles are erected after every 1 meter, but at the corners poles are erected already.
So,
Along the one side width of flowerbed,total 11 poles are to be erected.
*See the attachment, when we mark points along length sides (A,E,J,F), so we need not to erect pole again there.
For 3 units, we need to erect only 2 poles.
Thus,
Total 22 poles on the width of flowebed.
Step 3:
Find the total poles erected.
Total poles
Thus,
Total 64 poles are to be erected.
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