From the top of the cliff an observer spots two ships out at sea. One is north east with an angle of depression of 6°while the other is south east with an angle of depression of 4°. If the two ships are 200m apart, find the height of the cliff, to the nearest metre.

by a long method of calculaions i got 350.92 = 351m.

is this correct??

is there an easier way to do it??