Triangle abc was translated 2 untits to the right and 3 units down. write the algebraic rule that describes the translation that was applied to triangle abc to create triangle a'b'c'.

Given that the angle is 25 degrees, we shall apply cosine rule to solve this question.
c^2=a^2+b^2-2abcosC
thus plugging the values we get:
15^2=x^2+20x^2-40xcos25
x^2-36.252x+175=0
thus solving the quadratic using quadratic formula we obtain:
x=[36.252+/-√614.208]/2
x=5.7 km or 30.5 km