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In , , cm, and . Without using a calculator, determine exact values for the following measures or ratios. 

Compute without a calculator

  1. Refer to the Math Notes box from lesson 4.2.4 for help with inverse trigonometry.
    You may want to solve part (b) before part (a).

  1. Then solve for .

  1. See hint for part (a).

  1. Use the information given and answer (c) to solve for using the Pythagorean Theorem.