Question

Find the sum of the interior
angles of a regular nonagon
(9-sided figure).

Answer 1

1260°

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
6. Addition
7. Subtraction

• Left to Right

Geometry

• Sum of Angles: 180(n - 2)

Explanation:

Step 1: Define

Number of sides n = 9

Step 2: Find

1. Substitute: 180(9 - 2)
2. Subtract: 180(7)
3. Multiply: 1260°