You are Here: Home >< Maths

# New Maths GCSE 9-1 Sample Question Confused?!

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. I was looking through my revision guide and this question looked easy until i tried it:
"A ship sails 12km on a bearing of 050°, then 20km on a bearing of 100°. It then sails directly back to its starting position. CALCULATE this distance to 1 d.p."

Anyone know how to do this without any drawings but only using the sine/cosine rule?
2. (Original post by NothingButWaleed)
I was looking through my revision guide and this question looked easy until i tried it:
"A ship sails 12km on a bearing of 050°, then 20km on a bearing of 100°. It then sails directly back to its starting position. CALCULATE this distance to 1 d.p."

Anyone know how to do this without any drawings but only using the sine/cosine rule?
It's a cosine rule question
Sketch the information and use your sketch and knowledge of bearing/parallel line angle facts to work out the angle between the 12 and 20 km lines.

Posted from TSR Mobile
3. (Original post by gdunne42)
It's a cosine rule question
Sketch the information and use your sketch and knowledge of bearing/parallel line angle facts to work out the angle between the 12 and 20 km lines.

Posted from TSR Mobile
Wait I dont fully follow...
Could you give me an example please?
Thanks!
4. (Original post by NothingButWaleed)
Wait I dont fully follow...
Could you give me an example please?
Thanks!
5. (Original post by gdunne42)
I figured out how to work out the right question mark but no hope for the left one...
How do you work out the "?" angle?
6. (Original post by NothingButWaleed)
I figured out how to work out the right question mark but no hope for the left one...
How do you work out the "?" angle?
You need to revise parallel line angle facts.
Alternate angles are equal

Posted from TSR Mobile
7. (Original post by gdunne42)
You need to revise parallel line angle facts.
Alternate angles are equal

Posted from TSR Mobile
Yeah I know those rules but if i used them the interior angles is 210 degrees which it cant be as angles add up to 180 in a triangle thats why im confused!
8. (Original post by gdunne42)
You need to revise parallel line angle facts.
Alternate angles are equal

Posted from TSR Mobile
Oh no never mind I figured out my mistake yeah i got it at the end thanks for our help!!

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: June 19, 2016
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:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams