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A right triangle with a base of 18 and a hypotenuse of x. An angle opposite the 18 side is 67 degrees.Estelle is trying to solve for in the triangle at right. She lost her scientific calculator, but luckily her teacher tells her that , , and .

  1. Write an equation that Estelle could use to solve for .

    Recall:  and 

  2. Without a calculator, how could Estelle determine sin ? Explain.

    What angle is complementary to ?