What is this angle ? A. It is an adjacent angle.
B. It is a right angle.
C. It is a vertical angle.
D. It is a supplementary angle.

Angles 1 and 3 are adjacent to angle 140. (because they are next to each other)

Angles 1 and 2, 1 and 140, 140 and 3, and 3 and 2 are supplementary (because together they add up to 180 degrees)

Angles 140 and 2 and 1 and 3 are vertical angles because they are across from each other.

This may be a little confusing, so don't be afraid to ask for clarification, but great luck!

if you was gonna solve for a, a is a   < -12