evation from a seagull on the water to the top of the lighthouse is 38o. If the distance between
the seagull and the raft is 7m, then what is the height of the lighthouse? Use the sine law to answer
a small object A at a horizontal distance a from O and at a vertical distance h below the level of
O. A hit is also made if the stone is projected from O with speed v at an angle of depression given
by (90-alpha). Prove that
v2 + ga cot(2alpha) = 0 and h + a tan(2alpha)=0.