Asked by kelvin
                please guys help me this question, how to solve it.
Calculate the total surface area of a hollow cylinder whose radius is 15 cm and height is 20 cm.
            
        Calculate the total surface area of a hollow cylinder whose radius is 15 cm and height is 20 cm.
Answers
                    Answered by
            Steve
            
    consider slicing down the side of the cylinder and unrolling the curved part. That is just a rectangle with the same height as the cylinder (h), and a width equal to the circumference (2πr).
So the area is just the inside plus the outside, which are the same, if the cylinder has essentially zero thickness.
A = 2*2πrh
    
So the area is just the inside plus the outside, which are the same, if the cylinder has essentially zero thickness.
A = 2*2πrh
                    Answered by
            Henry
            
    As = 2(pi*r^2) + 2pi*r*h = Total surface area.
Convert r and h to meters.
    
Convert r and h to meters.
                    Answered by
            Henry
            
    Oops! the first term of my Eq does not exist, because the cylinder is hollow.
    
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