   # In a semicircle, the circular segment ADB is folded along AB to make the circular..............What is the length of AB?

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In a semicircle, the circular segment ADB is folded along AB to make the circular segment ATB. The point T is tangent to the diameter and divides the diameter into lengths of 4 and 2.
What is the length of AB?  posted Jun 1, 2020
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