Can someone explain this on how to complete it?

56°

Step-by-step explanation:

180°-139° = 41

180°-83°-41° = 56°

im bad at explaining bcuz eng is not my 1st language

56 Deg.

Step-by-step explanation:

First, you need to use the Exterior Angles Theorem which states that the two opposite sides of a exterior angle add up to the exterior angle. So in this case,

83 + m<1 = 139

So then, you can do algebra and subtract 83 from both sides.

Then,  

m<1 = 139 - 83

m<1 = 56 Degrees.

honesty mood

step-by-step explanation: