Question

solve this please.. please

Answer 1

Since, DO and CO are equal,∠OCD=∠ODC

In ΔDOC, 30°+ 30°+ ∠DOC= 180°⇒∠DOC=120°

Since, DO is bisector of ∠D, ∠ODC=∠ADO=30°

∠DAB+∠ABC=∠BCD=∠CDA=360°

⇒100°+∠ABC+60°+60°=360°⇒∠ABC=140°

HOPE THIS HELPED YOU.