1) [tex]\overline{JK} \perp \overline{MN}[/tex]
2) [tex]\angle JKM[/tex] is a right angle (perpendicular lines form right angles)
3) [tex]\triangle JKM[/tex] is a right triangle (definition of a right triangle)
4) [tex]\angle 1[/tex] and [tex]\angle 2[/tex] are complementary (the acute angles of a right triangle are complementary)
