GCSE Maths | Angles in Polygons Last updated on 27 May 2025 The interior angles in a polygon add up to (n-2) x 180oInterior angle + exterior angle = 180oExterior angles add up to 360o One interior angle + one exterior angle = 180oQuestion 1Question 2 Previous GCSE Maths | Product Rule for Counting Next Edexcel AS-Level Economics Paper 1 June 2023