# Need Geometry help to calculate the length of a segment

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### Question Description

shyamnair3
School: New York University

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We have to make use of the below theorem to solve this problem.

If a secant segment and tangent segment are drawn to a circle from the same external point, the product of the length of the secant segment and its external part equals the square of the length of the tangent segment.

$\\ AB^2=AD\times AC\\ \\ AB^2=7\times 28\\ \\ AB^2=196\\ \\ AB=\sqrt{196}\\ \\ AB=14$

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