Join TSR now and get all your revision questions answeredSign up now
    • Thread Starter
    Offline

    2
    ReputationRep:
    I don't really know where to start..

    Attached Images
     
    Offline

    3
    ReputationRep:
    Have you drawn a diagram yet?

    Posted from TSR Mobile
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by danconway)
    Have you drawn a diagram yet?

    Posted from TSR Mobile
    That's where I got stuck. I didn't really know how to visualise it in this case :/
    Offline

    3
    ReputationRep:
    (Original post by creativebuzz)
    That's where I got stuck. I didn't really know how to visualise it in this case :/
    Name:  ImageUploadedByStudent Room1419889420.297842.jpg
Views: 129
Size:  107.9 KB
    Would you agree?


    Posted from TSR Mobile
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by danconway)
    Name:  ImageUploadedByStudent Room1419889420.297842.jpg
Views: 129
Size:  107.9 KB
    Would you agree?


    Posted from TSR Mobile
    Yup, I would agree! And we want to find the remaining side, however we don't know any of the interior angles so we can't perform trigonometry :/
    Offline

    3
    ReputationRep:
    (Original post by creativebuzz)
    Yup, I would agree! And we want to find the remaining side, however we don't know any of the interior angles so we can't perform trigonometry :/
    Cosine rule
    Offline

    3
    ReputationRep:
    Do some angle chasing first, and you'll see why it works (obviously you'll need the angle before you can use the cosine rule ). Think 'F-angles'.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by danconway)
    Do some angle chasing first, and you'll see why it works (obviously you'll need the angle before you can use the cosine rule ). Think 'F-angles'.
    I can't seem to find the angle :/
    Offline

    3
    ReputationRep:
    (Original post by creativebuzz)
    I can't seem to find the angle :/
    It's well hidden! Look around the point with the 138º angle on it. Work out anything you can find (even if it might seem insignificant!).
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by danconway)
    It's well hidden! Look around the point with the 138º angle on it. Work out anything you can find (even if it might seem insignificant!).
    Well I guess I could do 180-138 = 42 and that will give me that tiny angle but I don't know..
    Offline

    3
    ReputationRep:
    (Original post by creativebuzz)
    Well I guess I could do 180-138 = 42 and that will give me that tiny angle but I don't know..
    If I told you that that 42º pops up somewhere else and is VERY handy, what would you say?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by danconway)
    If I told you that that 42º pops up somewhere else and is VERY handy, what would you say?
    I would say that 42 also an interior angle because of the alternate segment theorem or..?
    Offline

    3
    ReputationRep:
    (Original post by creativebuzz)
    I would say that 42 also an interior angle because of the alternate segment theorem or..?
    Probably doesn't work... 42 is just anti-clockwise of the 251, going from North on that point anticlockwise to the line joining the first point and that point.... Because corresponding angles.
    Offline

    3
    ReputationRep:
    Name:  ImageUploadedByStudent Room1419892425.689740.jpg
Views: 68
Size:  108.0 KB That kinda idea.


    Posted from TSR Mobile
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by danconway)
    Probably doesn't work... 42 is just anti-clockwise of the 251, going from North on that point anticlockwise to the line joining the first point and that point.... Because corresponding angles.
    I don't see it :/
    Offline

    3
    ReputationRep:
    (Original post by creativebuzz)
    I don't see it :/
    Name:  ImageUploadedByStudent Room1419892574.296993.jpg
Views: 70
Size:  112.6 KB


    Posted from TSR Mobile
    • Thread Starter
    Offline

    2
    ReputationRep:
    Ohh I see now! Thank you! Damn, I really need to scratch up on my basic angle facts, would you advice just doing a couple of questions on basic angles?
    Offline

    3
    ReputationRep:
    (Original post by creativebuzz)
    Ohh I see now! Thank you! Damn, I really need to scratch up on my basic angle facts, would you advice just doing a couple of questions on basic angles?
    Well it seems that they'd definitely help! You can always have a quick check on here to revise them
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by danconway)
    Well it seems that they'd definitely help! You can always have a quick check on here to revise them
    Yeah, I feel like I need to brush up on my basics, because they always come back to haunt me! :P But thank you for being so patient with me (positive rating given to show appreciation)!
    Offline

    3
    ReputationRep:
    (Original post by creativebuzz)
    Yeah, I feel like I need to brush up on my basics, because they always come back to haunt me! :P But thank you for being so patient with me (positive rating given to show appreciation)!
    Aha aw, well anything to help, and thanks for the rep!

    I'll be off to bed – have fun with the rest of the problem (although going to bed is a great idea for everyone!); I can always help more tomorrow if you need it, but hopefully you can work it out from here!
 
 
 
Poll
Which pet is the best?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.