\"\"

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Radius of the circle O is given by 10 units and AB = 10.

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Draw radius \"\".\"\" is a right angle triangle.

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\"\"                                  (\"\")

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\"\" bisects \"\"                        (A radius perpendicular to a chord bisects it)

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\"\"                          (Apply definition of segment bisector)

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\"\"                          (Substitute AB = 10)

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\"\"                                    (Divide)\"\"

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The value of \"\".