Angle between the lines joining `(3,1,-2)` to `(-1,0,1)` and `(2,3,1)`is

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

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

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

Find the angle between the line joining the points (-1,3) and (-2,4) and X -axis.

The acute angle between the lines joining points (2, 1, 3) and (1, -1, 2) and the line having direction ratios 2, 1, -1 is

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 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 A(2,1,-3), B(1,-1,2) and the line vecr = (2hati - hatk) + lambda(3hati + hatj) is