Mathematics for IGCSE & O level - Scale Drawings (Section 2 - No. 5)
If the bearing of point X from point Y is 030°, what is the approximate bearing of Y from X?
030°
150°
210°
330°
Giải thích
Reverse bearing (30 + 180 = 210 if less than 180, however, as it is greater, subtract 180 from 30 (30-180 = -150) which results in 360 - 150 = 210. This logic is inaccurate, so must be 30+180.