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9-91.

Examine the diagram of the triangle at right.

  1. Write an equation representing the relationship of the side lengths using only and .

    Use the pythagorean theorem.

  2. Write an expression for . What is if ?

    If , then  .

  3. Write an expression for . What is if ?

    If , then .

Right triangle labeled, hypotenuse, R, horizontal leg, X, vertical leg, Y, and angle opposite vertical leg, labeled, theta.