GeometryHardNumber Theory Toolkit ShareNumber Theory Toolkit · Hard problemA polygon has exactly 202020 diagonals. What is the sum of its interior angles?A1440∘1440^\circ1440∘B1080∘1080^\circ1080∘C900∘900^\circ900∘D720∘720^\circ720∘E1090∘1090^\circ1090∘Check Show answer Walk through it step by step Practice more like this Review this concept