Observe the object from the observer's point of view to distinguish the left and right sides. The left hand side of the observer is left, and the right hand side of the observer is right.
Scheme 1:
Ab =103m.
¡Ï¡ÏA = 90¡ã£¬¡ÏACB = 60¡ã£¬
¡à¡ÏB=30 degrees, AC= 10m,
¡àBC=20£¬
¡àAB= 10 3 m company
Option 2:
According to t