$\"\"$

The values given by the circle A,are $\"\"$ and $\"\"$ .

Here BAC is right angled triangle.

Hence $\"\"$ .

Use pythagorean theorem to find x.

$\"\"$ (Apply Pythagorean theorem)

$\"\"$ (Substitute $\"\"$ , $\"\"$ and $\"\"$ )

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

$\"\"$ (Subtract 64 from each side)

$\"\"$

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

$\"\"$ (Apply squart root of each side)

$\"\"$ (length is not negative) $\"\"$

The value of $\"\"$ .