# [ARBLE], <s>73</s> 60 bytes

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    "The hypotenuse of this right triangle is %.3f"%(a^2+b^2)^.5

[Try it online!][TIO-lf922rbo]

[ARBLE]: https://github.com/TehFlaminTaco/ARBLE
[TIO-lf922rbo]: https://tio.run/##SyxKykn9/18pJCNVIaOyIL8kNa@0OFUhP02hJCOzWKEoMz2jRKGkKDMxLz0nVQEooqpnnKakqpEYZ6SdFGekGadn@v//f@P/JgA "ARBLE – Try It Online"