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A Minor Arc Subtended by a What??

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Author: Annie Fetter
Description: Geometry, difficulty level 2. A chord of a circle is the hypotenuse of an isosceles right triangle whose legs are radii of the circle. The length of the chord is 6 times the square root of 2. What is the length of the minor arc subtended by the chord?
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Problem page: http://mathforum.org/geopow/solutions/19971031.geopow.html
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