If AB  = 4 m  and AC  = 8m , the angle of elevation of A as observed from C is.

The length of the string of a kite flying at 100 metres above the ground with the elevation of 60^o is.

The angle formed by the line of sight with the horizontal, when the point being viewed is above the horizontal level is called.

The length of shadow of a tower 50 m high at the time of the angle of elevation 45^o is.

The value of AB in the given figure is.

If a pole 10 m high cause a shadow 10m long on the ground, then the sun's elevation is.

The measure of angle of elevation of the top of a 75 √3  m   high tower from a point at a distance of 75 m from the foot of tower in a horizontal place is.

If a pole of height of 6 m cause a shadow 2√3 m long on the ground. Then the sun's elevation is.

The length of the shadow of a tree 7 m, when the sun's elevation is 45^o is.

When the angle of elevation of the sun is 30^o, the length of the shadow caused by 50 m high building is