
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 $\bigtriangleup DEF$, $DE = EF = 19$, and $DF = 30$. What is the area of $\bigtriangleup DEF$?
A) $100\qquad$ B) $150\qquad$ C) $175\qquad$ D) $250\qquad$ E) $300$

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