# Chapter 8 - Right Triangles and Trigonometry - 8-3 Trigonometry - Practice and Problem-Solving Exercises - Page 510: 20

39

#### Work Step by Step

17= reference angle x= adjacent angle 12= opposite angle tan= adj/opp tan 17= 12/x multiply both sides by x x tan 17= 12 divide both sides by tan 17 x= 12/tan 17 x= 39

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