If OD is perpendicular to AC and AC $= 8$ units, what is the length of AD?

4 units

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16 units

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2 units

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8 units

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Solution

The correct option is A 4 units
According to the property of a circle's chord and its perpendicular, the perpendicular from the center to the chord bisects the chord.
$A C = 2 A D$
$8 = 2 A D$
$A D = 4 u n i t s$

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