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Junior high school grade one math topic: intersection line and parallel line!
Solutions; : ∠ EAC = 27, Ba ⊥ EF, AC∨BD are known. Ask ∠DBA ∠FAB

∵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.