For the N-Level and O-Level exams, you need to be familiar with the names of polygons ranging from Pentagon to Octagon. Additionally, it’s helpful to know the names of Nonagon and Decagon, as some schools include these in their curriculum and exams. Be sure to memorize the formulas for the sum of interior angles, the sum of exterior angles, and each exterior angle of a regular polygon. I’ve found that students often forget these formulas, so reviewing them regularly is crucial
