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My teacher was away

 

 Apr 30, 2020
 #1
avatar+266 
+2

The answer is 477.5 cool

 Apr 30, 2020
 #3
avatar+111438 
+1

Thx, Mathisgood   !!!

 

We both got the same answer.....always a good omen.......

 

cool cool cool

CPhill  Apr 30, 2020
 #2
avatar+111438 
+2

At both ends we have two circles each with a radius of 4 in 

 

The area of these  =  2 * pi * 4^2   =   32 pi

 

 

The   lateral suface area  ( area of the "side" )   =  2 * pi * radius * height  =

 

2 * pi * 4 * 15   =  120 pi

 

Putting this all together the surface area  =  ( 32 + 120)  pi ≈   477.5 in^2 

 

 

cool cool cool 

 Apr 30, 2020

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