posted by Pauline Duma on .
john is standing 100 metres away from a building.the angle of elevationto the top of the building is8 degrees .He now walks straight away from the building.When he stopes,the angle of elevation is only 1 degree and 48 seconds.How far away is now from the base of the building.
The height H of the building can be found from the equation:
After he "backed-up" to a distance of D from the building, the new relation with the height is:
So substitute H from (1) into (2) to get
Can you take it from here?
(The answer is around 450m)