Answer:

Step-by-step explanation:
Corresponding angles of two parallel lines are always equal. The angle on "top" of
corresponds with the angle marked as
. Therefore, its measure must also be
.
Since these two angles form one side of a line which has 180 degrees, we have the following equation:

Combine like terms:

Subtract 15 from both sides:

Divide both sides by 3:

Answer:
angle 2
Step-by-step explanation:
adds up to 180 degrees
The answer is about 3.3333
So to rewrite it so that we can find the side, we just need to isolate the a variable.

So firstly, divide by 6 on both sides of the equation: 
Next, square root each side, and your answer should be 
Answer:
A or d to narrow it down
Step-by-step explanation:
Hopefully you can figure out which one I am sorry.