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In the circle with center D shown below,...

In the circle with center D shown below, the length of radius `bar(CD)` is 4 cm, the length of `bar(BC)` is 1 cm, and `bar(BC)` is perpendicular to radius `bar(AD)` at B. When `/_ADC` is measured in degree, which of the following expressions represents the length, in centimeters, of `bar(AC)`?

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