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Home > GC > Chapter 5 > Lesson 5.3.3 > Problem 5-89


A right triangle with angles 61 degrees, and 29 degrees. The hypotenuse is 42. The leg opposite the 61 degree angle is, y.Eugene wants to use the cosine ratio to find on this triangle.  

  1. Which angle should he use to write an equation and solve for using the cosine ratio? Why?

    He'll need the adjacent side and the hypotenuse. To which angle is adjacent?

  2. Set up an equation, and solve for using cosine.