16)the angle of elevation of the top of a tower from a point A on the ground is 30 degree.on moving a distance of 20metres towards the foot of the tower to a point B the angle of elevation increases to 60 degree.find the height o the tower and the distance of the tower from the point A.

Let the height of the tower be h m.

In right ΔDCB,

In right ΔDCA,

Thus, distance of tower from point A = x + 20 = 30 m

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