
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
Roll a die twice in succession, and let the numbers obtained be $a$ and $b$ respectively.

(Ⅰ) Find the probability that $a^2 + b^2 = 25$;

(Ⅱ) Assuming the lengths of three line segments are $a$, $b$, and $5$ respectively, find the probability that these three line segments can form an isosceles triangle (including equilateral triangles).

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