To Determine the Width of a River

PQ, the width of the river= W

AB, the known distance= x

Sub Topics

At 'A '

- observe the angles PAQ, QAB

- observe the angles ABP and ABQ

Now, in D^le PAB, we know that values of and AB.

\ AP can be determined.

In D^le QAB, we know the values of and AB.

\ AQ can be determined.

In D^le PAQ, we know the values of AP, AQ and

\ PQ can be determined.