The height of a building or the width of a river can be measured without climbing or crossing it. In this chapter we will show how it is made possible. Some suitable angles and distances will be measured to achieve the above results.
1. At a point 50 m from the foot of a building, the angle of elevation of the top of the building is 70o 36'. Find the height of the building.
2. The shadow of a vertical lower on level ground increased by 10 m when the altitude of the sun changed from 45o to 30o. Using the given figure, find the height of the tower, correct to one place of decimal.
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