At an angle of elevation 610 captain on a ship noticed a person on the top of a cliff waiving towards the ship. To see him better, captain moved his ship 92m closer to the cliff. The angle of elevation at that moment was 690 . Determine the height of the cliff to the nearest tenth of a meter.
SOLUTION
Here is the sketch of the scenario;
First, we separate the triangles;
Here, we apply the Sine Rule;
In this case we apply a and c. i.e.
Therefore,
Then, considering the last triangle, which is right-angle triangle, we have;
We consider the SOHCAHTOA concept, where we apply the sine formula (SOH)
(To the nearest tenths)
Therefore, Height of the cliff is
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