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Home > PC > Chapter 2 > Lesson 2.3.4 > Problem 2-117

2-117.

Find the value of for each triangle.

  1. Triangle labeled as follows: left side, x, right side, 6, bottom left angle, 35 degrees, bottom right angle, 50 degrees.

    Find the 3rd angle. Should you use the Law of Sines or Cosines to solve for ?

    Law of Sines would be easiest.

Triangle labeled as follows: left side, 7, right side, x, bottom side, 5, left bottom angle, 120 degrees.

Should you use the Law of Sines or the Law of Cosines to find ? Why?

Use the Law of Cosines, because the Law of Sines needs an angle and a value of an opposite side.