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A silo has a cylindrical part and a roof that is a hemisphere.the radius of the cylinder is 3 m and it’s height is 12 m. What is the surface area of the silo?  The entire silo is to be painted. Find how much paint is needed if 1 L of paint covers 8.5 square metres of surface 

 Dec 3, 2020
 #1
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a rectangular pyramid with length 8cm,width 5 cm, and vertical height 17 cm

 Dec 3, 2020
 #2
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Surface area of hemisphere  =   2pi r^2  =  2pi *(3)^2  =  18pi m^2

 

Lateral surface area of silo  =  2pi r * h   =  2pi  (3)(12)  =  72 pi m^2

 

Total area =   (18 + 72) pi  m^2     =  90 pi m^2

 

Litres of paint needed =   [  90 pi ] / 8.5  ≈  33.3  L    

 

cool cool cool

 Dec 3, 2020

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