June 3rd, 2019, 04:44 AM  #1 
Math Team Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 911 Thanks: 64 Math Focus: सामान्य गणित  Solid angle
There are three vectors with same origin OA, OB and OC Angle between OA and OB = Y Angle between OA and OC = X And they are at right angle. What is the angle between OB and OC? Last edited by MATHEMATICIAN; June 3rd, 2019 at 04:50 AM. 
June 3rd, 2019, 04:49 AM  #2 
Newbie Joined: May 2019 From: Australia Posts: 8 Thanks: 0 
Either XY or YX, depending on which of the vectors is in the middle.

June 3rd, 2019, 05:26 AM  #3 
Math Team Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 911 Thanks: 64 Math Focus: सामान्य गणित 
Is it arccos (cos X . cos Y) ?

June 3rd, 2019, 12:10 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 21,113 Thanks: 2327  
June 4th, 2019, 10:37 AM  #5 
Math Team Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 911 Thanks: 64 Math Focus: सामान्य गणित 
triangle OAB and OAC are in two perpendicular planes

June 4th, 2019, 03:13 PM  #6 
Global Moderator Joined: Dec 2006 Posts: 21,113 Thanks: 2327  

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angle, solid 
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