A surveyor at a point A observes that the peak M of a mountain lies in the direction

degree east of north and the angle of elevation of AM above the horizontal is

degree . He also observes that a point B lies due north of A and the angle of elevation of AB above the horizontal is

. The surveyor moves to the point B and observes that M now lies in the direction

east of north . He measures that the distance AB and finds that it is equal to l . Show that the height of M above the horizontal which passes through A is

Show also that the angle of elevation

of BM above the horizontal is given by

I am unsure about the sketch . Can someone show it to me because i cant do anything without the sketch . Really thanks for your time !! Can someone correct my latex as well . Thanks .