Double Triangle
Double Triangle
DOUBLE TRIANGLE:
Let AB be a tower and B be its foot. On the horizontal line through B, take two points P and Q, Measure the length PQ.
Let PQ = a.
Let the angles of elevation of the top A of the tower as seen from P and Q be respectively and
, then
Let AB = x, BQ = y
From right angled
From right angled
...............(ii)
From equations (i) and (ii)
Also,
In the above case , P and Q are on the same side of the tower.
If the two points are on the opposit sides of the tower then from the adjoining figure, we get
and
A flagstaff of height h is mouted on the top of a building. From a point on the ground, the angles of elevation of the foot and top of the flagstaff are | |||
| Right Option : D | |||
| View Explanation |
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