The angle of elevation of a cliff from a point A on the ground and from point B ,50m vertically above point are alpha and beta respectively .The height of the cliff in m is?
let the height of the cliff be PQ = h m
the angle of elevation from point A is
the angle of elevation from point B is
let the point A is at distance of x m from the foot of the cliff .
in the right angled triangle PAQ;
now in the right angled triangle PBC;
hope this helps you