
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
An isosceles triangle $ABC$ is inscribed in a circle with $\angle BAC = \frac{\pi}{7}$ radians. Points $B$ and $C$ have tangent lines to the circle that intersect at point $D$. If $\angle ABC = \angle ACB = 3\angle D$, determine the measure of angle $D$ in radians.

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