HELP PLEASE! The distances from a ship to two lighthouses on the shore are 4 miles and 7 miles respectively. If the angle between the two lines of sight to the lighthouses is 48 degrees. Find the distance between lighthouses?
Mathematics · College · Tue Nov 03 2020
llm
Answered on
Using law of cosine :
c² = a² + b² - 2abCosc
c² = 7² + 4² - 2(7)(4)Cos48°
c² = 49 + 16 - 56(0.66)
c² = 27.52
c = 5.25 miles