Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    0
    ReputationRep:
    The diagram shows a parallelogram.
    The sizes of the angles, in degrees, are

    2x
    3x – 15
    2x
    2x + 24

    Work out the value of x

    3x – 15 is top left
    2x top right
    2x+24 bottom right
    2x bottom left

    I feel like I should know how to do it but I'm baffled - if someone could talk me through it that'd be great!
    Offline

    11
    ReputationRep:
    The opposite angles in a parallelogram are the same. You need an equation.
    • Thread Starter
    Offline

    0
    ReputationRep:
    How do I get the equation? What am I not getting?!!

    Thanks for the reply!
    Offline

    11
    ReputationRep:
    (Original post by KittyKat10)
    How do I get the equation? What am I not getting?!!

    Thanks for the reply!
    Choose 2 opposite angles and make them equal to each other. Only one pair will do because the other pair is already the same.
    Offline

    0
    ReputationRep:
    If you add up all the angles it would be 360 degrees, so if you do that, and rearrange it into an equation, you should get it


    Posted from TSR Mobile
    • Study Helper
    Offline

    16
    ReputationRep:
    Study Helper
    (Original post by KittyKat10)
    The diagram shows a parallelogram.
    The sizes of the angles, in degrees, are

    2x
    3x – 15
    2x
    2x + 24

    Work out the value of x

    3x – 15 is top left
    2x top right
    2x+24 bottom right
    2x bottom left

    I feel like I should know how to do it but I'm baffled - if someone could talk me through it that'd be great!
    Both the suggestions you've been given will work. If you're feeling really enthusiastic, try both methods and check that you get the same answer
    Offline

    7
    ReputationRep:
    2x + 24 = 3x - 15
    24 +15 = 3x - 2x
    x = 39.

    Check that using x=39 gives you 360 when adding up the four angles.
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Has a teacher ever helped you cheat?
    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
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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

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