The Area of the triangle is one half the Area of the parallelogram

formed by 2 vectors

A = 1/2|UxV| = 1/2 |U||V|sin(t)

Write this as A =1/2 xy sin(t) x= 150 y = 200 and t = pi/3

dA = 1/2 [(ysin(t) dx + xsin(t)dy + xycos(y)dt]

for dt make sure to use use pi/180