Maths year 11

Announcements Posted on
    Offline

    2
    ReputationRep:
    (Original post by z_o_e)
    Got it!! I got 71% on that work!!

    Now this...



    Posted from TSR Mobile
    Sorry I put my answers in terms of Pi because I'm lazy.

    Offline

    2
    ReputationRep:
    (Original post by z_o_e)
    I got the top ones. I think they are right. What about these?



    Posted from TSR Mobile
    Cross section of the first one is quarter of a circle.
    For the second youre finding the volume of the solid outer bit of the pipe. So the cross sectional area you're concerned with will be the area of the larger circle - area of the smaller circle.
    • Thread Starter
    Online

    2
    ReputationRep:
    (Original post by 34908seikj)
    Sorry I put my answers in terms of Pi because I'm lazy.

    So it's Csa*L

    These are tricker ones do I use same method :/



    Posted from TSR Mobile
    Attached Images
     
    Offline

    2
    ReputationRep:
    (Original post by z_o_e)
    So it's Csa*L

    These are tricker ones do I use same method :/



    Posted from TSR Mobile

    • Thread Starter
    Online

    2
    ReputationRep:
    (Original post by 34908seikj)
    I got them all wrong "(

    The answer was 7.3
    2) 2
    3) 7.2

    I think it's working out isn't right.


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by z_o_e)
    I got them all wrong "(

    The answer was 7.3
    2) 2
    3) 7.2

    I think it's working out isn't right.


    Posted from TSR Mobile
    Ugh, my answers are incorrect, are you sure?

    I rounded to two 2dp, so my answers are correct for questions 1 and 3, lemme figure out where I went wrong on 2.
    • Thread Starter
    Online

    2
    ReputationRep:
    (Original post by 34908seikj)
    Ugh, my answers are incorrect, are you sure?
    According to the website.


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by z_o_e)
    According to the website.


    Posted from TSR Mobile
    ohhhh for question two, I didn't multiply by 1/2. Sorry, that's my fault.
    Offline

    2
    ReputationRep:
    (Original post by z_o_e)
    I got them all wrong "(

    The answer was 7.3
    2) 2
    3) 7.2

    I think it's working out isn't right.


    Posted from TSR Mobile
    You're supposed to do it to 1 decimal place.
    • Thread Starter
    Online

    2
    ReputationRep:
    (Original post by Ano123)
    You're supposed to do it to 1 decimal place.
    I did.

    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    Did you round it correctly?
    • Thread Starter
    Online

    2
    ReputationRep:
    (Original post by Ano123)
    You're supposed to do it to 1 decimal place.
    Heya. I'm going to start from today xx

    I needed explanation on this question please.

    I would like to workout the answers and stuff all by myself as I wouldn't learn if I got them x



    Posted from TSR Mobile
    Attached Images
     
    • Thread Starter
    Online

    2
    ReputationRep:
    (Original post by 34908seikj)
    Did you round it correctly?


    Posted from TSR Mobile
    Attached Images
     
    Online

    3
    ReputationRep:
    (Original post by z_o_e)
    Heya. I'm going to start from today xx

    I needed explanation on this question please.

    I would like to workout the answers and stuff all by myself as I wouldn't learn if I got them x



    Posted from TSR Mobile
    If you let the length BD be denoted  y , then using the triangle on the right hand side we get
     \displaystyle \sin 42^{\circ} =\frac{12.8}{y} .
    Online

    3
    ReputationRep:
    If you let BCA be denoted  x , then  \displaystyle \tan x =\frac{12.8}{6.8} . So you just solve for  x .
    • Thread Starter
    Online

    2
    ReputationRep:
    (Original post by B_9710)
    If you let BCA be denoted  x , then  \displaystyle \tan x =\frac{12.8}{6.8} . So you just solve for  x .
    I did this


    Posted from TSR Mobile
    Attached Images
     
    Online

    3
    ReputationRep:
    (Original post by z_o_e)
    I did this


    Posted from TSR Mobile
    You're working out the wrong angle.
    Offline

    2
    ReputationRep:
    (Original post by z_o_e)
    Heya. I'm going to start from today xx

    I needed explanation on this question please.

    I would like to workout the answers and stuff all by myself as I wouldn't learn if I got them x



    Posted from TSR Mobile
    For part b

    Use Sin to find BD, you can do this because you have the opposite side to an angle. - SOHCAHTOAH - Sin opp/hyp Cos adj/hyp Tan opp/adj


    So set it up like this: 12.8/x = Sin(42)

    Now try rearranging the formulae to make x the subject.


    Long time no see Zoe, have you been revising
    • Thread Starter
    Online

    2
    ReputationRep:
    (Original post by B_9710)
    You're working out the wrong angle.
    Oh?
    Is this fine?

    Posted from TSR Mobile
    Attached Images
     
    Online

    3
    ReputationRep:
    (Original post by z_o_e)
    Oh?
    Is this fine?

    Posted from TSR Mobile
    That's right.
 
 
 
Write a reply… Reply
Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  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
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: December 3, 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.

Poll
How are you feeling about doing A-levels?
Study resources

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.