
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In the diagram, what is the measure of $\angle ACB$ in degrees? 
[asy]
size(250);
draw((-90,0)--(0,0));
draw((0,0)--(60,90)--(180,0)--cycle);
label("$A$",(60,90),N);
label("$115^\circ$",(60,87),S);
label("$140^\circ$",(0,0),NW);
label("$B$",(0,0),S);
label("$D$",(-90,0),S);
label("$C$",(180,0),S);
[/asy]
In the diagram, $\angle ABD = 140^\circ$. What is the measure of $\angle ACB$?

Present the answer in LaTex format: \boxed{Your answer}
user