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What is the length of the blue segment in O Below

What is the length of the blue segment in O Below-example-1
User Xinrui Ma
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well, let's recall the chord distance to center theorem, which says that two congruents chords are equidistant from the center of the circle.

so if the chords are congruent, both of them are 12.48, and the distance from the center to AB is 8.53, then the distance from the center to CD is also 8.53.

User Tobycoleman
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