My Math Forum 3D Shapes with algebra

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April 11th, 2018, 05:18 AM   #1
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3D Shapes with algebra

I have tried doing this many times but I cannot find the distance from X to A. Please help!
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 April 11th, 2018, 05:44 AM #2 Senior Member   Joined: May 2016 From: USA Posts: 1,310 Thanks: 551 What are you studying? You have asked three questions that seem quite unrelated. In any case, your diagram is too small for me to read.
April 11th, 2018, 05:49 AM   #3
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Bigger diagram
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 April 11th, 2018, 06:38 AM #4 Global Moderator   Joined: Dec 2006 Posts: 20,820 Thanks: 2159 The required area = the area of the "base" of the discarded cone = $\pi h^2\!$.
April 12th, 2018, 03:38 AM   #5
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Quote:
 Originally Posted by skipjack The required area = the area of the "base" of the discarded cone = $\pi h^2\!$.
Sorry, I don't fully understand, why $\pi h^2\!$?

 April 12th, 2018, 07:07 AM #6 Global Moderator   Joined: Dec 2006 Posts: 20,820 Thanks: 2159 The discarded cone is geometrically similar to the original cone so its height and base radius are equal. Its height is given as h, so its base radius is h. Thanks from Student2018

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