Fig 11 7
© NCERT
not to be republished
 MATHEMATI CS
474
l2
S
T
Q
P
l1
The line GE that goes diagonally across the ceiling and the line DB passes through
one corner of the ceiling directly above A and goes diagonally down the wall These
lines are skew because they are not parallel and also never meet By the shortest distance between two lines we mean the join of a point in one line
with one point on the other line so that the length of the segment so obtained is the
smallest