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IMAS 2019–2020 Junior Division — First Round Question 10

IMAS · IMAS 2019–2020 Junior Division — First Round

Question 10

In a triangle $ABC$, $AB=AC$. Line segments $AD$ and $AE$ trisect $\angle BAC$, as shown in the figure. If $\angle ADB=110^\circ$, what is $\angle ABC$ in degree?

Question illustration
  1. 30
  2. 35
  3. 40
  4. 45
  5. 60