Question

Sum of measures of angles of a Nonagon is ${1260}^o$. Find how much each angle is measured.

• A. ${100}^o$
• B. ${140}^o$
• C. ${108}^o$
• D. ${90}^o$

Answer 1

Answer: (B)

${140}^o$

Each angle $=\frac{(n-2)\times {180}^o}{n}$
$=\frac{(9-2)\times {180}^o}{9}$
$=\frac{7\times {180}^o}{9}={140}^o$
Therefore, B is the correct answer.