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it is too simple
in ∆ BDC and ∆DEC
BD= DE. ((by applying trigo))
CD= CD (((COMMON)))
EDC= CDB (90°)
so it is congruence
in ∆ BDC and ∆DEC
BD= DE. ((by applying trigo))
CD= CD (((COMMON)))
EDC= CDB (90°)
so it is congruence
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