Fill in the blanks: KL is ___ to ON. LM is ___ to MN.

The statement is "KL is ______ to ON".
Observe figure 'f'. Line segment KL is a vertical line. Line segment ON is also a vertical line. Vertical lines that do not intersect are parallel.

The statement is "LM is ______ to MN".
Observe figure 'f'. Line segment LM is a horizontal line. Line segment MN is a diagonal line. There is a right angle symbol at point M, indicating that the angle formed by LM and MN at M is $90^\circ$. When two line segments intersect at a $90^\circ$ angle, they are perpendicular.

KL is parallel to ON
LM is perpendicular to MN