# Lumos StepUp - SBAC Online Practice and Assessments - Grade 11 Mathematics Tangent to a circle

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## A worker wishes to determine the radius of a fluid tank, but access is only available to the outside of the structure. The worker devises a plan to determine the radius by utilizing the relationship of the tangent line to the radius as shown in the diagram below.The following measurements were taken.AB = AC = 12 ft. AD = 6 ft. Complete the steps below to determine the radius of the tank.a) Determine $$\textit{m}\;\angle ABO.$$

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