in the figure AB=AC.prove that BD=BC
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let DBC=X°
BDC=30°+40°=70°
In ∆ABC,
40°+30°+x+30°+x =180° [AB=AC]
x°=40°
BCD=BDC=70°
BD=BC
BDC=30°+40°=70°
In ∆ABC,
40°+30°+x+30°+x =180° [AB=AC]
x°=40°
BCD=BDC=70°
BD=BC
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