Originally posted by eagle:for question b, confirm AT = 143 m (3 s.f.)
Used 2 methods to confirm.
It is definitely not 95.4 m
But then, if you don't consider the 30 degrees,
AH² + 100² - 2(AH)(100) cos 53.8 = 200²
AH² -120AH – 30000 = 0
AH = (120 +- sqrt(120² +4*30000))/2
AH = 243.3m or -123m (N.A.)
hi eagle, thanks! i really thought my method was wrong -_-. thanks again.