Help with the working out : / (1 Viewer)

pikachu975

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I kinda forgot how to integrate to find volume but I'm assuming you find the volume of the red+blue area rotated (cylinder volume with radius 2, height y = ln4) and minus the blue are rotated around the y axis (equation x = 0.5e^y).
 

mikikieko12

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I kinda forgot how to integrate to find volume but I'm assuming you find the volume of the red+blue area rotated (cylinder volume with radius 2, height y = ln4) and minus the blue are rotated around the y axis (equation x = 0.5e^y).
Ohh, okay! I get it, I only applied the disc method and didn't consider the shells method. Will try and see if this will yield the right result.

Thanks a lot for the guidance!
 
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