$\"\"$

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Diameter of the circle A is given by 10 units.

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2AX be the diameter of the circle A.

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$\"\"$

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$\"\"$ (Divide each side by 2)

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$\"\"$ units. (Simplify) $\"\"$

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$\"\"$ is the one part of the radius $\"\"$ .

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$\"\"$ (Apply segment addition postulate)

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

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$\"\"$ (Subtract 2 from each side)

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$\"\"$ units. (Simplify) $\"\"$

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The value of the $\"\"$ units.