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∠A.=∠D AB=DC ∠ACB=∠DBC AC=BD
关于CD所在直线的对称点E.恰好为AB的中点,则∠B的度数是( ) A.60° 45° 30° 75°
=80°,∠ACB=40°,则∠ACD等于( ) A.80° 60° 40° 20°
关于CD所在直线 的对称点E.恰好为AB的中点,则∠ 的度数是 ( ) A.30°B.45° 60° 75°
AB=DC,AC=DB AB=DC,∠ABC=∠DCB BO=CO,∠A.=∠D AB=DC,∠DBC=∠ACB
∠A.=∠D AB=DC ∠ACB=∠DBC AC=BD
∠A.=∠D AB=DC ∠ACB=∠DBC AC=BD
的度数是( ) A.55° 65° 75° 85°
AB=DC,AC=DB AB=DC,∠ABC=∠DCB BO=CO,∠A.=∠D AB=DC,∠DBC=∠ACB
∠A.=∠D AB=DC ∠ACB=∠DBC AC=BD ,
140° 130° 120° 110°
20° 30° 45° 60°
AB=DC,AC=DB AB=DC,∠ABC=∠DCB BO=CO,∠A.=∠D AB=DC,∠DBC=∠ACB
=75°,∠ACB=45°,则∠BCD等于( ). A.80° 60° 40° 20°
∠A.=∠D AB=DC ∠ACB=∠DBC AC=BD