What is the measure of the missing side

Answer:
The answer is A
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Answer:
55
Step-by-step explanation:
Square the legs.
52^2=2704
19^2=361.
Add 2704 and 361 to get 3065.
Now, we are left with 3065=x^2 so we can now square both sides. After plugging it into a calculator, we get 55.36 and we can round it to 55.
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