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

    13
    ReputationRep:
    (Original post by notnek)
    Where did you get 5 from?

    The first step is to use the fact that the area is 42 to find the length of the base. Have you done this?
    5 is part of the pythagorean triple, 5,12 and 13


    and no how would I do this?
    • TSR Support Team
    • Study Helper
    Offline

    20
    ReputationRep:
    (Original post by CraigBackner)
    5 is part of the pythagorean triple, 5,12 and 13


    and no how would I do this?
    Yes but you only know that one of the sides is 12 so you can't assume that the other two sides are 5 and 13 - the triangle sides may not be a pythagorean triple. If you knew two of the sides were 5 and 12 then you could assume that the third must be 13.

    The area of a triangle = 1/2 x base x height.

    You know this is equal to 42 and you know the height is 12. So what is the base?
    Offline

    13
    ReputationRep:
    (Original post by notnek)
    Yes but you only know that one of the sides is 12 so you can't assume that the other two sides are 5 and 13 - the triangle sides may not be a pythagorean triple. If you knew two of the sides were 5 and 12 then you could assume that the third must be 13.

    The area of a triangle = 1/2 x base x height.

    You know this is equal to 42 and you know the height is 12. So what is the base?
    ok i see and working it out the base is 7 and then what to I do next?
    Offline

    18
    ReputationRep:
    (Original post by CraigBackner)
    ok i see and working it out the base is 7 and then what to I do next?
    Note that the triangle is isosceles.
    • TSR Support Team
    • Study Helper
    Offline

    20
    ReputationRep:
    (Original post by CraigBackner)
    ok i see and working it out the base is 7 and then what to I do next?
    Draw a vertical line down from A to divide the triangle into two right-angled triangles. These triangles have lengths 12 and 3.5 (half the base). If you find the top angle in this right-angled triangle then you can double it to get x.
    Offline

    13
    ReputationRep:
    (Original post by _gcx)
    Note that the triangle is isosceles.
    The base of the isosceles is 7 but what can I do with it
    Offline

    18
    ReputationRep:
    (Original post by CraigBackner)
    The base of the isosceles is 7 but what can I do with it
    You are able to split it into two congruent triangles, per notnek.
    Offline

    13
    ReputationRep:
    (Original post by notnek)
    Draw a vertical line down from A to divide the triangle into two right-angled triangles. These triangles have lengths 12 and 3.5 (half the base). If you find the top angle in this right-angled triangle then you can double it to get x.
    (Original post by _gcx)
    You are able to split it into two congruent triangles, per notnek.
    Ohh I see and thanks for helping!
    Offline

    3
    ReputationRep:
    CAN SOMEONE PLEASE HELP ME WITH THIS RATIO QUESTION


    Jane records how many millimetres of rain fall each month in her garden.

    In February, there was 16 mm more rain than in January.
    In march, there was 5 mm more rain than in February.
    The total amount of rain for January, February and March was 172 mm.
    Work out the amount of rain in January
    Offline

    3
    ReputationRep:
    (Original post by Zxrxh)
    CAN SOMEONE PLEASE HELP ME WITH THIS RATIO QUESTION


    Jane records how many millimetres of rain fall each month in her garden.

    In February, there was 16 mm more rain than in January.
    In march, there was 5 mm more rain than in February.
    The total amount of rain for January, February and March was 172 mm.
    Work out the amount of rain in January
    I had this question for my term test. Okay so we need to find out how much rain there was in January but we don't know so let rain of January be "x".
    In february there was 16mm more rain so the expression would be x+16
    In march there was 5mm more rain than in February so the expression would be (x+16)+5.
    Then we know that the total amount of rain was 172 so add all the expressions together..
    x+x+16+(x+16)+5 = 172
    Then rearrange for x and then u would have the answer!
    No ratios needed xD!
    Offline

    3
    ReputationRep:
    (Original post by NothingButWaleed)
    I had this question for my term test. Okay so we need to find out how much rain there was in January but we don't know so let rain of January be "x".
    In february there was 16mm more rain so the expression would be x+16
    In march there was 5mm more rain than in February so the expression would be (x+16)+5.
    Then we know that the total amount of rain was 172 so add all the expressions together..
    x+x+16+(x+16)+5 = 172
    Then rearrange for x and then u would have the answer!
    No ratios needed xD!
    i thought it was ratio lool thanks btw i now get it
    Offline

    3
    ReputationRep:
    (Original post by Zxrxh)
    i thought it was ratio lool thanks btw i now get it
    No worries!
    Offline

    18
    ReputationRep:
    This is just out of interest: has anyone looked at, any A-level material? It's something that I'd recommend if you're interested in maths as a whole.
    Offline

    3
    ReputationRep:
    CAN SOMEONE PLEASE HELP ME WITH THIS QUESTION:

    Pete records all his maths test scores.
    Each score is a mark out of 100.

    After 9 tests his mean score is 59
    After 10 tests his mean score is 58.5
    After 11 tests his mean score is 60

    Work out the difference between his scores on the 10th and 11th tests.
    • TSR Support Team
    • Study Helper
    Offline

    20
    ReputationRep:
    (Original post by Zxrxh)
    CAN SOMEONE PLEASE HELP ME WITH THIS QUESTION:

    Pete records all his maths test scores.
    Each score is a mark out of 100.

    After 9 tests his mean score is 59
    After 10 tests his mean score is 58.5
    After 11 tests his mean score is 60

    Work out the difference between his scores on the 10th and 11th tests.
    Have a read through this thread.

    If you still need help then let us know in this thread.
    Offline

    3
    ReputationRep:
    (Original post by notnek)
    Have a read through this thread.

    If you still need help then let us know in this thread.
    i still dont understand it
    Offline

    3
    ReputationRep:
    (Original post by notnek)
    Have a read through this thread.

    If you still need help then let us know in this thread.
    is the answer 113.95 ????
    • Community Assistant
    • Welcome Squad
    Offline

    20
    ReputationRep:
    (Original post by Zxrxh)
    is the answer 113.95 ????
    The difference between scores on two different tests out of 100 can't be more than 100...

    What part of that thread do you not understand?
    Offline

    18
    ReputationRep:
    (Original post by Zxrxh)
    is the answer 113.95 ????
    No, can you post your working?
    Offline

    3
    ReputationRep:
    (Original post by RDKGames)
    The difference between scores on two different tests out of 100 can't be more than 100...

    What part of that thread do you not understand?
    all of it
 
 
 
  • 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
    Did TEF Bronze Award affect your UCAS choices?
    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

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