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

    0
    ReputationRep:
    Name:  IMG_20170122_101527.jpg
Views: 15
Size:  489.7 KB
    Can anyone explain this question. Answer is 15. Not sure what the question is asking.
    Offline

    11
    ReputationRep:
    When you walk all the way round the exterior of a polygon, pointing your arm out in front of you, you will see that your arm turns through 360 degrees. It only turns through an angle when you get to a vertex, a point where two sides meet.

    If the polygon has 8 equal external sides, then it also has 8 equal external angles (i.e. the angles made between each of the external sides). So if the size of the external angle is a, then we must have 8a=360 from which we can find a.

    In your case, you can find the external angle for the shape by geometry, but you need to find the number of sides n, say. Can you finish this? You need to write down an equation similar to the one I gave above, then solve it.
    Online

    20
    ReputationRep:
    you need to find the acute angles in the trapezia. then find the internal angle of the big polygon.... then the external angle.... then the number of sides.
    • Thread Starter
    Offline

    0
    ReputationRep:
    So the tiles continue to form a full circle? I understand now I think.
 
 
 
  • 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
    What newspaper do you read/prefer?
    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.