Answer:
89 degrees.
Step-by-step explanation:
The angles on a triangle always add up to 180. Therefore we have to subtract what angles we already have from 180 to get the missing angle
180-(49+42)
180-91= 89
The missing angle is 89 degrees.
I hope this helped!
Answer: its 18.27
Its Sine
A
I did it on a test too
