The distance from airport A to airport C is 770.88 miles.
The square of a side of a plane triangle equals the sum of the squares of the remaining sides minus twice the product of those sides and the cosine of the angle between them.
Let x is the distance from airport A to airport C.
The other angle is,
= 73+36
= 109
Now, using cosine law,
x² = 550² + 390² - 2(550)(390)cos(109)
x²= 454600 + 139668.73
x= 770.88 miles
Learn more about this concept here:
https://brainly.com/question/13625569
#SPJ1