Hello, checkmarks!
]1. A helicopter hovers directly above the landing pad on the roof of a 125 m high building.
A person is standing 145 m from the base of the building.
The angle of elevation of the helicopter from this person is 58°.
How high is the helicopter hovering about the landing pad? Code:
*H
* |
* | y
* |
* *A
* |
* |
* | 125
* |
* 58° |
O* - - - - - - - - - *B
145
This one doesn't require the Law of Cosines.
The observer is at . .The helicopter is at .
The building is . . .
Let
In right triangle , we have: .
Therefore: . m.
2. One ship leaves a port and sails at 17 km/h on a bearing of 024 degrees.
A second ship leaves the same port at the same time and sails at 21 km/h
on a bearing of 071 degrees.
How far apart are the two ships after 2 hours?
The bearing is measured clockwise from North.
After two hours, the positions of the ships look like this: Code:
A
: *
: * *
: * * x
: * *
: * *
: *34 *
: * * B
:24° * *
: * *
: * 47° * 42
: * *
:* *
*
P
Now we can use the Law of Cosines.
Therefore: . km.