**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

## Polygons

### About the Author: Tutor Jason

I am a Full-Time Math Tutor I have a Bachelor of Science (Math) with Merit, a Master Degree in Education (Education Technology) and a Business Administration Degree. I have a total of 21 years experience tutoring secondary school students. I specialize in tutoring Singapore syllabus O-Level Elementary Math (E-Math), Additional Math (A-Math) and Sec 1 and 2 Math.
I offer Small Group Tuition in Woodlands. My students reside in the North i.e. Sembawang, Choa Chu Kang, Yishun, Yew Tee, Admiralty and of course Woodlands. I also offer small group tuition at Boon Lay. Students come from Jurong West and Taman Jurong.