x Turn on thread page Beta
 You are Here: Home >< Maths

# hEYA watch

1. Hey please look at the attachment thank you. x
Attached Images

2. (Original post by User23)
Hey please look at the attachment thank you. x
Angle between north and LA = 70 degrees.

Angle between LA and LB = 210 - 70 = 140 degrees.

You now know an angle with two sides; use the cosine rule to find AB.
3. (Original post by User23)
Hey please look at the attachment thank you. x
Well you're given measurement of two sides, and also two angles, so use cosine rule
4. (Original post by ombtom)
Angle between north and LA = 70 degrees.

Angle between LA and LB = 210 - 70 = 140 degrees.

You now know an angle with two sides; use the cosine rule to find AB.
wait i dont know how u got the angle between LA and LB?
5. (Original post by ombtom)
Angle between north and LA = 70 degrees.

Angle between LA and LB = 210 - 70 = 140 degrees.

You now know an angle with two sides; use the cosine rule to find AB.
Is this it?
Attached Images

6. (Original post by User23)
Is this it?
That's exactly right. If you add 70 and 140, you get 210.
7. (Original post by ombtom)
That's exactly right. If you add 70 and 140, you get 210.
ok cool thanks x

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 23, 2015
Today on TSR

### Loughborough better than Cambridge

Loughborough at number one

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams