Sum of Interior or Internal angles of a polygon : Derivation of a Formula

Derivation of formula to find sum of interior angles of a polygon.Learn to derive a formula to find number of unique possible diagonals of a polynomial. Formula is derived in easy to understand way. This will also help you to remember it easily. It is very useful to solve general mental ability problems asked in various competitive exams. For more such videos Visit or Subscribe to    / mathssmart   For collaborations and business inquiries, please contact via Channel Pages: http://ChannelPages.com/MathsSmart