∵BA⊥EF∴∠BAE=∠FAB=90
* East African Community =27 ∴∠CAB=63
∵AC∥BD∴∠DBA=∠CAB=63
A: The dispatcher of Port B observed that the cargo ship at Point A was 63 meters east of his north. To direct the cargo ship at point A to enter port B, the cargo ship should turn its bow 90 degrees to the right on the basis of its original course.