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1-39.

Use the idea of an inverse to calculate the measure of the indicated angle in each triangle. 

  1. Right triangle labeled as follows: vertical leg, 7, hypotenuse, 12, angle opposite vertical leg, x.

    Use appropriate trigonometric ratio.

    Use the inverse sine button on a calculator.

  1. Right triangle labeled as follows: vertical leg, 5, hypotenuse, 15, angle opposite horizontal leg, y.

    Follow the same procedure used in part (a).

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