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4-65.

Triangle DEF Lizzie notices that two angles in , shown at right, have the same measure. Homework Help ✎

  1. Based on this information, what statement can you make about the relationship between and ?

    What's true about sides opposite equal angles in a triangle?

  2. Determine the length of if mm.

    Divide into two congruent right triangles.

    Use trigonometry to determine .