Answer:
16.7°
Step-by-step explanation:
We solve this using the Cosine rule formula
From the question we have
Side a = 14
Side b = 15
Side c = ?
We are given Angle C = 70°
Hence,
c² = a² + b²− 2ab cos(C)
Hence,
c² = 14² + 15² - 2(14 × 15) × cos (70°)
c =√[ 14² + 15² - 420 × cos (120°)]
c = 16.65387 °
Approximately to the nearest tenth
c = 16.7°
