Two angles (a + 31) and (b - 49^o) are adjacent angles on a straight line. Which of the following is true

A.

a + b = 198^o

B.

a + b = 180^o

C.

a + b = 162^o

D.

a + b = 100^o

E.

a + b = 80^o

View answer & explanation

Correct answer is A

a + 31 + b - 49 = 180^o(sum of angles on str line)
a + b - 18 = 180^o
a + b = 180 + 18
a + b = 198^o

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