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Write a function is_right_triangle(a: int, b: int, c: int) -> bool that takes three side lengths and returns True if they form a right triangle.

A right triangle satisfies the Pythagorean Theorem: the square of the longest side must equal the sum of the squares of the other two sides.

For example:

• 3, 4, 5 forms a right triangle (since 3² + 4² = 5²).
• 5, 12, 13 is also a right triangle.