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Home > CCG > Chapter 5 > Lesson 5.1.4 > Problem 5-46


Estelle is trying to find in the triangle at right. She lost her scientific calculator, but luckily her teacher told her that , , and . Homework Help ✎


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

Use the Triangle Angle Sum Theorem to calculate the missing angle, this means all the angles in a triangle total .

Place a "" on the missing side. Write the trigonometric ratios for the angle, reference the Math Note box in Lesson 5.1.2 for extra help.

Which equation can be used to solve for ?

  1. Without a calculator, how could Estelle find ? Explain.