32度18分的余角是：
90°-[32+(18/60)]°
=90°-32.3°
= 57.7°
=57°+0.7*60′
=57°42′
PS：
90°00′-32°18′
=89°60′-32°18′
=89.60-32.18
=57.42
=57°42 ′