
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 an isosceles triangle ABC, where AB = AC, an altitude is drawn from vertex A to the midpoint D of base BC, and it's given that AB = 10 units, and BC = 16 units. Calculate the length of the altitude AD.
A) 5 units
B) 6 units
C) 7 units
D) 8 units

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