March 15th, 2009, 04:28 PM  #1 
Member Joined: Mar 2009 From: San Bernardino, California Posts: 50 Thanks: 0  Spherical Coordinate Problem
I have been studying for a midterm coming up this Thursday in my Calculus class but I'm not particularly good with spherical coordinates. On the study guide he gives this problem: > Convert to spherical coordinates and sketch. Given that: in a spherical system, I plugged the spherical equivalents and came up with: So from this I thought it must be a right circular cone making an angle of declination of between the positive zaxis and the xyplane but in my book, a similar problem, says its a double cone (eg the type conic sections are derived from). Could anyone explain to me why this? 
March 15th, 2009, 05:46 PM  #2 
Senior Member Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3  Re: Spherical Coordinate Problem
Because phi is plus or minus?

March 15th, 2009, 05:51 PM  #3 
Member Joined: Mar 2009 From: San Bernardino, California Posts: 50 Thanks: 0  Re: Spherical Coordinate Problem
Oh wow just duh. I don't know why I had it in my head that was between the positive zaxis and the negative portion of the xyplane. I'm still getting used to 3D. Thanks.


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