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In triangle ABC, DE is parallel to AC. Side AD measures 5.3 units, side DB measures 8.0 units, and DE measures 4.8 units. What is the measure of AC?

  • geometry - ,

    by similar triangles,

    AC/AB = DE/DB
    AC/(5.3+8.0) = 4.8/8.0
    AC = 7.98

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