$\"\"$

The given values are $\"\"$ .

$\"\"$ (Use pythagorean theorem)

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

$\"\"$ (Cancel squares and roots) $\"\"$ \ \

$\"\"$ (Subtract 3 from each side)

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

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

$\"\"$ (Subtract: $\"\"$ ) $\"\"$

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

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

$\"\"$ (Use calculator)

Length cannot be negative , so the missing length is 5.65 units. $\"\"$

The length is 5.65 units.