Math
posted by Tareena drwls check my answer please .
Two Planes leave an airport at the same time, one flying 300km/h and the other at 420km/h
The angle between their flight paths is 75 degrees after three hours, how fart apart are they?
answer:
so it would be c^2=a^2+b^22ab cos C
900^2+1260^22(900)(1260)(cos75)
c^2=33542.9
c=183.14km
is it right?

Right equation, but you did not do it correctly.
c^2 = 810,000 + 1,587,600  587,002
= 1,809,998
c = 1345 km