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What is the length of CF? look at image attached

What is the length of CF? look at image attached-example-1
User Antonio MG
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If two chords intersect each other inside a circle, the products of their segments are equal.

СF * DF = BF * EF
СF * 14 = 7 * 17
14СF = 119
СF = 119/14
СF = 8.5
User Davide Icardi
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