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# Scale and Bearings

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by

## Mr Mattock

on 2 January 2017

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#### Transcript of Scale and Bearings

The bearing of B from A is 127 . Work out the bearing of A from B.
307
The bearing of C from A is 140 . D is due North of C on the line between A and B. Given that the angle ACB is a right angle, find the bearing of C from B.
230
Scale and Bearings
Three rules for Bearings
L.O. - To use bearings with scale drawings, and solve bearings problems.
Bearings are angles measured:

1) In a clockwise direction
2) From a line drawn due North.

Bearings are always given using 3 figures to ensure clear transmission of information.
Activities
Activity

Key
Examples

Bearings and Scale Drawings
Bearings and Scale Drawings
Bearings Calculations
N
N
127
o
A
B
The bearing of B from A is 127 . Work out the bearing of A from B.

The bearing of C from A is 140 . D is due North of C on the line between A and B. Given that the angle ACB is a right angle, find the bearing of C from B.
Bearings Calculations
N
N
127
o
A
B
o
C
D
13
40
o
53
o
o
o
50
o
77
o
53
o
o
o
Activity
Complete the bearings and scale booklet.
Activity
Complete the bearings and scale booklet.
https://keshmathsdotcom1.files.wordpress.com/2015/11/77.pdf
Starter
Find the values of angles d and e. Give reasons for your answers.
Starter
Find the values of angles d and e. Give reasons for your answers.
d = 50 as it is corresponding to the 50 .
e = 60 as it is a triangle with a 90 and a 30 , which is 30 because the alternate angle is 50 and part is 20 , so the remainder is 30 .
o
o
o
o
o
o
o
o
o
Activity
Complete the bearings challenges.
Activity
Complete the bearings challenges.
Part 4
- 295
- 300
- 271
- 122.5
Part 5
- A and B are the wrong way around in the sentence.
- Gone anti-clockwise instead of clockwise, should be 280 .
- Measured incorrect angle, should be 310 .
- Missing a 0, should be 070 .
- Letters wrong way round, should be "bearing of J from L".
o
o
o
o
o
o
o
Full transcript