$\"\"$

The given values are $\"\"$ .

$\"\"$ (Use pythagorean theorem)

$\"\"$ (Substitute $\"\"$ )

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

$\"\"$ (Subtract 16 from each side)

$\"\"$ (Commutative property odf addition: $\"\"$ )

$\"\"$ (Apply additive inverse property: $\"\"$ )

$\"\"$ (Apply additive identity property: $\"\"$ )

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

$\"\"$ (Cancel square and root)

$\"\"$ (Use calculator)

Length cannot be negative , so the missing length is 23.66 units. $\"\"$

The length is 23.66 units.