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If the height of the cylinder is 10 inches, and the surface area is 200 sq. inches, determine the length of the radius

The formula for the surface area of a cylinder is: A=2pirh+2pir^2

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SURENDRA K. | An experienced,patient & hardworking tutorAn experienced,patient & hardworking tut...
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2*pi*r*h +2*pi*r^2=  200
 
2*pi*r*10 + 2*pi*r ^2=200
 
20*pi*r +2*pi*r^2= 200
 
6.28*r^2+62.85*r-200=0
 
Solving this quadratic equation using
 
Roots are = (-b+-sqrt(b^2-4ac))/2a
 
r= 2.53 inches
 
So, radius = 2.53 inches
 

Comments

I have put this answer in several times and it says that it is incorrect. That is the answer that I got as well.