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3.05 Bearings

Worksheet
Compass and true bearings
1

Consider point A in the following diagrams:

i

Find the true bearing of A from O.

ii

Determine the compass bearing of point A from O.

a
b
c
d
2

Determine the true bearing of the following:

a

Northeast

b

Southwest

3

Determine the true bearing of point B from point A in the following bearings diagram:

4

Determine the true bearing of point A from point B in the following bearings diagram:

5

In the figure below, point B is due East of point A:

a

Find the true bearing of point A from point C.

b

Find the compass bearing of point A from point C.

6

Consider the following diagram:

a

Find the true bearing of point B from point C.

b

Find the compass bearing of point B from point C.

7

Consider the following diagram:

a

Find the true bearing of point C from point A.

b

Find the compass bearing of point C from point A.

Applications
8

A plane travels \text{N } 36 \degree \text{W} for 9 \text{ km} and then changes direction to \text{S } 30 \degree \text{W} for 4 \text{ km} and then changes one last time to \text{S } 49 \degree \text{E} for 7 \text{ km}.

Draw a diagram that represents its journey.

9

A plane travels \text{N } 40 \degree \text{E} for 9 \text{ km} and then changes direction to \text{S } 34 \degree \text{E} for 4 \text{ km} and then changes one last time to \text{S } 47 \degree \text{W} for 7 \text{ km}.

Draw a diagram that represents its journey.

10

During a group hike, a hiker walked 6 \text{ km NE} of base camp. In the evening, the hiker was separated from the group and after a night lost in the wilderness, the hiker was found 6 \text{ km NW} of the base camp.

What compass bearing did the hiker follow during the night?

11

A boat sets off on a bearing of 058 \degree \text{ T}. After some time, it needs to turn back and head to its original position. Find the true bearing it must travel.

12

Consider the following diagram:

If the bearing of the clearing from the town is a \degree, find a to the nearest degree.

13

A boat travelled due south for 2 \text{ km}, and then due east for 3 \text{ km}, as shown in the diagram:

a

Given that the angle of the compass bearing is a \degree, write the compass bearing of the boat from its starting point in terms of a \degree.

b

Find the value of a. Round your answer to the nearest degree.

c

Write the bearing of the boat from its starting point as a true bearing.

14

Shortly after take-off, a plane is 42 \text{ km} south and 57 \text{ km} west of the airport in Sydney that it left from:

a

Find the size of the angle marked b, to one decimal place.

b

Hence, find the compass bearing of the plane from the airport.

c

State the true bearing of the plane from the airport.

15

The position of a ship S is given to be 20 \text{ km} from P, on a true bearing of 0 49 \degree \text{ T}. The position of the ship can also be given by its \left(x, y\right) coordinates.

a

Find the ship's x-coordinate to one decimal place.

b

Find the ship's y-coordinate to one decimal place.

16

Luke sailed for 116 \text{ km} on a bearing of 231 \degree.

If w is how many kilometres west he has sailed from his starting point, find w to one decimal place.

17

Tobias and Patricia are participating a hiking and orienteering activity with their school. At one point in the activity, they are trying to reach a checkpoint on a private farm fence that is 102.7\text{ m} from their position, at a bearing of 068\degree \text{ T}.

They can't travel to the checkpoint directly because they would be trespassing, so they decide to travel due east and then due north to get to the checkpoint.

a

How far east will Tobias and Patricia have to travel? Round your answer correct to two decimal places.

b

How far north will Tobias and Patricia have to travel? Round your answer correct to two decimal places.

18

On an orienteering course, Valentina runs 550 \text{ m} north from point A to point B, then turns east and runs to point C.

If the true bearing of C from A is 041 \degree \text{ T}, find the distance, d, to the nearest metre.

19

Three television presenters are practising their navigation skills before heading off on an expedition to a remote location.

Belinda at point B is positioned 17.6 \text{ m} south of Amelia at point A. Carl at point C is due east of Belinda and on a bearing of \text{S } 38 \degree \text{E} from Amelia.

If Amelia and Carl are d \text{ m} apart, find d to one decimal place.

20

During a rescue search, a helicopter flew west from point X to point Y, then changed course and flew 10.7 \text{ km} north to point Z.

If point Z is on a bearing of 335 \degree \text{ T} from point X:

a

Find the size of \angle YXZ.

b

If the distance from point Y to point X is b \text{ km}, find b to one decimal place.

c

If the distance that the helicopter must fly between point Z and point X is d \text{ km}, calculate d to one decimal place.

21

A yacht sailed in a direction so that its final position was 248 \text{ km} west and 225 \text{ km} south of its starting point.

a

If the true bearing on which the yacht sailed is b \degree, find the value of b to one decimal place.

b

If the boat has sailed a total of d \text{ m}, find the value of d to one decimal place.

22

A rally car starts at point P and races 191 \text{ km} south to point Q. Here the car turns west and races for 83 \text{ km} to point R. At point R the car must turn to head directly back to point P.

a

Find angle a, to one decimal place.

b

Determine the compass bearing of P from R, to one decimal place.

c

Hence, determine the compass bearing of R from P, to one decimal place.

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Outcomes

ACMEM117

apply the tangent ratio to find unknown angles and sides in right-angled triangles

ACMEM119

apply the cosine and sine ratios to find unknown angles and sides in right-angled triangles

ACMEM120

solve problems involving bearings

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