Question

Eight angles of a nonagon measure 1389, 154º. 145°, 132°, 148°, 143,

147°and 150°. What is the measure of the ninth angle?

Answer 1

103°

Explanation:

The total angle in a nonagon is 1260. To get the missing angle, we add up all the given angle together and subtract it from 1260.

138 + 154º + 145° + 132° + 148° + 143 + 147 + 150 = 1157

1260 - 1157 = 103

Therefore, the missing angle is 103°