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Home > A2C > Chapter 8 > Lesson 8.2.2 > Problem 8-136

8-136.
  1. Find the value of x in each triangle. Homework Help ✎

Use the Law of Cosines.

C2 = A2 + B2 − 2ABcos(c)
(x)2 = (15)2 + (21)2 − 2(15)(21)cos(40°)

x ≈ 13.542

Find the last angle, then use the Law of Sines.

x ≈ 68.770