Two angles (a + 31) and (b – 49o) are adjacent angles on a straight line. Which of the following is true
-
a + b = 198o
- a + b = 180o
- a + b = 162o
- a + b = 100o
- a + b = 80o
The correct answer is: A
Explanation
a + 31 + b - 49 = 180o(sum of angles on str line)a + b - 18 = 180o
a + b = 180 + 18
a + b = 198o