Two angles (a + 31) and (b - 49o) are adjacent angles on a straight line. Which of the following is true
A
a + b = 198o
B
a + b = 180o
C
a + b = 162o
D
a + b = 100o
E
a + b = 80o
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
a + 31 + b - 49 = 180o(sum of angles on str line)
a + b - 18 = 180o
a + b = 180 + 18
a + b = 198o
Source: Myschool Past Questions Archive (Record #23826)