
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
Right triangle ABC has a perpendicular height from A to BC measuring 12 units and an angle θ at B such that $\cos \theta = \frac{4}{5}$. Calculate the length of side BC.
A) 10
B) 15
C) 18
D) 20
E) 25

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