12.) Astronomers often measure large distances using astronomical units (AU) where 1 AU is the average distance from Earth to the Sun. In the image, drepresents the distance from a star to the Sun. Using a technique called "stellar parallax," astronomers determined 0 is 0.00001389 degrees. NOT TO SCALE Sun Earth A.) How far away is the star from the Sun in astronomical units (AU)? Show your reasoning. B.) Write an expression to calculate d for any star.

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