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Question
question
given the circle below with secant \\( \overline { g f e } \\) and tangent \\( \overline { d e } \\), find the length of \\( \overline { d e } \\).
round to the nearest tenth if necessary.
answer
Step1: Use the tangent - secant theorem
The tangent - secant theorem states that if a tangent segment \(DE\) and a secant segment \(GFE\) are drawn to a circle from an external point \(E\), then \(DE^{2}=EF\times EG\).
We know that \(EF = 27\) and \(EG=EF + FG=27 + 14=41\).
Step2: Calculate \(DE\)
Substitute the values into the formula \(DE^{2}=EF\times EG\). So \(DE^{2}=27\times41\).
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\(DE\approx33.3\)