
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
If the lateral surface of a cone is unfolded into a semicircle, then the apex angle of the cone (the angle between two generatrices in the section that passes through the axis of rotation of the cone) is

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