Angle between the lines joining `(-7,4,-1)` to `(0,1,5)` and `(-1,-3,7)`is

Find angle between the lines formed by joining (2,2,1) with (3,1,4) and (7,2,2)

Find the angle between the lines Joining the points (-1,2),(3,-5) and (-2,3),(5,0)

The acute angle between the line joining the points (2,1-3) and (-3,1,7) and a line parallel to (x-1)/(3)=(y)/(4)=(z+3)/(5) through the point (-1,0,4) is

The angle between the lines joining the points (1,1,0), (-3,sqrt(3)+1,3) and (0,-1,0), (-1,sqrt(3)-1,lambda) is cos^(-1)(sqrt((7)/(16))) .If lambda is an integer then lambda .

Find the angle between x+y=3 and the line joining points (1,1) and (-3,4)

The acute angle between the line joining the points (1,1,7), (-3,4,7) and a line parallel to (1-x)/(-1)=(2y-7)/(6)=(z+3)/(0) through the point (-1,0,4) is

The angle between the line joining the points (1,-2) , (3,2) and the line x+2y -7 =0 is

The acute angle between the line joining the points ,(1,1,7),(-3,4,7) and a line parallel to (1-x)/(-1)=(2y-7)/(6)=(z+3)/(0) through the point (-1,0,4) is