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

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