The values are given by the circle C, and .
Here MPO is right angled triangle.
Hence .
Use pythagorean theorem to find x.
(Apply Pythagorean theorem)
(Substitute , and )
(Evaluate powers)
(Subtract 256 from each side)
(Subtract: )
(Apply squart root of each side)
(Because x is length)
The value of .
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