F4 Math Revision Assignment #4 - Bearings

Bearings

North-East-South-West

Fill in the Blanks

Complete this statement:

Bearings are angles measured from ____________, in a _______________ direction, using _________ digits.

Multiple Choice

What direction is indicated by the number 6?

• north

• east

• south

• west

Measure from North

Always measure from North

Bearings are always given with 3 figures

Not one or two. Like the 3 musketeers - they stick together.

Measure your bearing clockwise

Not anticlockwise please!!!

Multiple Choice

What is the correct bearing

• 304

• 44

• 56

• 056

Multiple Choice

What is the bearing of X from Y?

• 215

• 035

• 30

• 145

Multiple Choice

Find the bearing of B from A

• 250^o

• 110^o

• 290^o

• 070^o

Multiple Choice

Find the bearing of A from B

• 130^o

• 050^o

• 230^o

• 290^o

Example

A snail travels 5metres on a bearing of 067°. Find how far east he is from his starting point.

Step one

Draw a line facing north

Draw an arrow in the direction of interest

If you are asked for an accurate drawing, you will need your protractor and compass - otherwise a rough sketch is fine.

Label your diagram with the information you have been given.

angle and distance please.

Draw a line from the point of your arrow to your north line

Not so bad, is it?

Figure out which Trig function will help you...

???

Our angle is opposite our length of interest so we need...

Sin

So our snail is 4.6 metres east of his start position.

Multiple Choice

What is the bearing of the direction East?

• 100 degrees

• 270 degrees

• 090 degrees

• 060 degrees

Multiple Choice

Find the shaded angle ABC

• 290^o

• 70^o

• 140^o

• 40^o

Multiple Choice

Find the bearing of A from B

• 060^o

• 120^o

• 300^o

• 240^o

Multiple Choice

What is the bearing of C from A?

• 45

• 225

• 045

• 135

Multiple Choice

What is the Bearing of A from B?

• 045

• 130

• 135

Multiple Choice

What is the bearing of B from A?

• 315

• 225

• 045

• 135

Fill in the Blanks

Given that angle ACB = 53 degrees, what is the bearing of B from C? Write your answer in the space below.

Fill in the Blanks

Given that angle BAC = 90 degrees. Use the cosine rule to find the length of BC. Write your answer in the space below.