Question
Discuss the triangulation method to measure the height of inaccessible object.
Solution
An object whose distance cannot be measured from the observation point, is called inaccessible object.
To measure the height of such an object BC, measure the two angles of elevation of the top of object C from two different points A1 and A2.
.To measure the height of such an object BC, measure the two angles of elevation of the top of object C from two different points A1 and A2.
Let
be the angles of elevation of topC at A1 and A2 respectively.
From figure,
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, is the height of the inaccessible object.
, is the height of the inaccessible object. 
