\"\"

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The given values are \"\".

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\"\"                                  (Use pythagorean theorem)

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\"\"                       (Substitute \"\")

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\"\"                          (Evaluate powers \"\")\"\"

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\"\"                               (Cancel square and root)

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\"\"                                       (Add: \"\")

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\"\"                                (Take the square root of each side)

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\"\"                                     (Cancel square and root)

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\"\"                                  (Use calculator) Length cannot be negative , so the missing length is 20.27units.

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\"\"

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The length is 20.27 units.