Question 19
How many diagonals does a convex 20-sided polygon have?
HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 02 Question 19
HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 02
HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 02