in a building there are 24 cylindrical pillars the radius of each pillars is 0.28 M and height is 4 cm find the total cost of painting the curved surface area of all pillars at the rate of 10 per metre square
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Answered by
2
In step 1 =Cylindrical pillars = 24
radius=0.28
height =4cm=0.4 m
rate 10 per m square
CSA=2πrh
=2×22÷7×0.28×0.4
2×22×0.4×0.4
44×1.6
70.4 m
rate of pillars=10×70.4
Rs 704
radius=0.28
height =4cm=0.4 m
rate 10 per m square
CSA=2πrh
=2×22÷7×0.28×0.4
2×22×0.4×0.4
44×1.6
70.4 m
rate of pillars=10×70.4
Rs 704
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h = 4cm = 0.04 m not 0.4m
it is wrong
oh so sorry bro
answer wrong hai kya
yes
answer bata de solve kar dunga
see second answer .
Answered by
1
Hi ,
I think there is an error in units of the height.
It may be like this ,
h = 4m
Dimensions of the cylidrical pillar :
radius = r = 0.28 m
height = h = 4m
number of pillars = 24
curved surface area of a pillar
= 2πrh
CSA of 24 pillars = 24 × 2πrh
cost of painting 1 sq m = Rs 10
Therefore ,
Total painting cost = 10 × 24 × 2πrh
= 10 × 24 × 2 × ( 22/7 ) × 0.28 × 4
= Rs 1689.60
I hope this helps you.
: )
I think there is an error in units of the height.
It may be like this ,
h = 4m
Dimensions of the cylidrical pillar :
radius = r = 0.28 m
height = h = 4m
number of pillars = 24
curved surface area of a pillar
= 2πrh
CSA of 24 pillars = 24 × 2πrh
cost of painting 1 sq m = Rs 10
Therefore ,
Total painting cost = 10 × 24 × 2πrh
= 10 × 24 × 2 × ( 22/7 ) × 0.28 × 4
= Rs 1689.60
I hope this helps you.
: )
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