SOLUTION: From a point, a point on the tower 20 m above the ground was observed .By doubling the angle of elevation another point of the tower which was 25 m vertically above the first was o

Question 1068467: From a point, a point on the tower 20 m above the ground was observed .By doubling the angle of elevation another point of the tower which was 25 m vertically above the first was observed.Find the distance between the foot of the tower and point of observation
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let X be the distance between the observer and the tower,

.
.

Using an identity,

Use a substitution for better readability,

Only the second solution is helpful,

So then,

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