An acute angle is less than 90°. An obtuse angle is between 90° and 180°. A reflex angle is between 180° and 360°. These are all right angles as they are all a quarter turn (90°).

To calculate the bearing subtract \(50^\circ\) from \(360^\circ\) to find the reflex angle (labelled H) as bearings must be given in a clockwise direction from north. The direction the ship sailed ...