All Junior Cert Technical Graphics posts
  • avatar image

    Rotations!!! Aoife24

    In transformation geometryI know how to get the point and swing the arcs I just have no idea how to get the points on the arcs! Someone help !

    1. avatar image

      DylanG

      Join the point you're rotating to the point you swung your arcs from, then use your protractor to bring the angle off at 120.. Hope this help ! If you're still stuck then let me know

    2. avatar image

      frans

      how to get the point of rotatation ? (eg rotate clockwise through 90 degrees ?

    3. avatar image

      DylanG

      It's usually the last thing you do in transformation geometry so join p3 to p4 then draw an angle at 45 from p3 and p4 until they meet them that's your rotation point

    4. avatar image

      DylanG

      Is its rotate at 120 then use a 30 angle instead 45 angle

    5. avatar image

      Aoife24

      If it's 90 degrees you use a 45 angle abs if it's 120 or 60 you use a 30 degree angle

    6. avatar image

      DylanG

      No if its 60 would you not use a 15 angle

    7. avatar image

      Aoife24

      No you use 30 aswell! Cause the formula is subtract the angle they give you from 180 them divide by two!

    8. avatar image

      Aoife24

      I used to think it was 15 aswell I got really confused

    9. avatar image

      DylanG

      You would use a 15 angle

    10. avatar image

      studybuddy15

      This should answer your question:

      https://www.youtube.com/watch?v=OU2eu7jzK5Q

      Hope it helps.

    11. avatar image

      DylanG

      Anyway I've never seen a rotation at 60

    12. avatar image

      Aoife24

      Actually I don't know that's just what I was told but it really doesn't matter cause the only ones that come up are 120 and 90

    13. avatar image

      DylanG

      What questions do you do ?

    14. avatar image

      Aoife24

      From the exam papers

    15. avatar image

      Aoife24

      I'm still really struggling with finding the points :/ I tried both the ways said here but I don't really understand them

    16. avatar image

      DylanG

      Look up a sample answer in YouTube and try a few yourself ! Even if you don't wanna do the whole transformation geo question just draw the shape out and put another point randomly on the page and try a rotation

    17. avatar image

      DylanG

      I've never used studybuddy15's was

    18. avatar image

      DylanG

      Way*

    19. avatar image

      Aoife24

      Okay thank you!

    20. avatar image

      Me

      Share files from your computer
      loader

Going to College