180°/7
=25°+5°/7
=25°+300′/7
=25°+42′+6′/7
≈25°+42′+51′′
=25°42′51′′
69°7′-36°25′18′′
=68°+6′+60′+60′′-36°-25′-18′′
=32°+41′+42′′
=32°41′42′′