M mati89 New member Joined Jun 23, 2018 Messages 1 Jun 23, 2018 #1 Calculate the angle at which the planes intersect -x-2y+z-5=0 i -2x+y-2z+1=0

tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 10,078 Jun 23, 2018 #2 mati89 said: Calculate the angle at which the planes intersect -x-2y+z-5=0 i -2x+y-2z+1=0 Click to expand... Can you find any of these... Direction Numbers Direction Cosines Normal Vectors For each plane?

mati89 said: Calculate the angle at which the planes intersect -x-2y+z-5=0 i -2x+y-2z+1=0 Click to expand... Can you find any of these... Direction Numbers Direction Cosines Normal Vectors For each plane?

H HallsofIvy Elite Member Joined Jan 27, 2012 Messages 5,111 Jun 27, 2018 #3 mati89 said: Calculate the angle at which the planes intersect -x-2y+z-5=0 i -2x+y-2z+1=0 Click to expand... One plane has normal vector <-1, -2, 1> and other has normal vector <-2, 1, -2>. What is the angle between the two vectors? Why was this posted in "Probability and Statistics"? Last edited: Jul 21, 2018

mati89 said: Calculate the angle at which the planes intersect -x-2y+z-5=0 i -2x+y-2z+1=0 Click to expand... One plane has normal vector <-1, -2, 1> and other has normal vector <-2, 1, -2>. What is the angle between the two vectors? Why was this posted in "Probability and Statistics"?