Find the angle between the pairs of lines with direction ratio proportional to: 5, -12, 13 and -3, 4, 5

Find the angle between the pairs of lines with direction ratio proportional to: 2, 2, 1 and 4, 1, 8

Find the angle between the pairs of lines with direction ratio proportional to: 1, 2, -2, and -2, 2, 1

Find the angle between the pairs of lines with direction ratio proportional to: a ,\ b ,\ c\ a n d\ b-c ,\ c-a ,\ a-bdot

Find the angle between the pairs of lines with direction-ratios : (i) lt 5, -12, 13 gt , lt -3, 4, 5 gt (ii) lt a,b,c gt , lt b, -c, c - a , a - b gt

Write the angle between the lines whose direction ratios are proportional to 1, -2, 1 and 4, 3, 2.

Find the angel between the vectors with direction ratios proportional to 1, -2, 1 and 4, 3, 2.

Find the angle between the vectors with direction ratios proportional to 1,-2,1 and 4,3,2.

Find the angle between the vectors with direction ratios proportional to 4,-3,5 and 3,4,5.

Find the acute angle between the lines whose direction ratios are proportional to 2:3:6 and 1:2:2.

Find the angle between the lines whose direction ratios are proportional a,b,c and b-c,c-a,a-b.