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HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 02 Question 17

HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 02

Question 17

One interior angle of a convex $n$-gon is selected. The other $n-1$ interior angles sum to $2020^\circ$. Find the selected angle.
  1. $130^\circ$
  2. $160^\circ$
  3. $140^\circ$
  4. $150^\circ$