
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
 $ABCD$  is a rectangle. The segment  $MA$  is perpendicular to plane  $ABC$  .  $MB= 15$  ,  $MC=24$   ,  $MD=20$ . Find the length of  $MA$  .

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