Thursday, July 27, 2017

Geometrical Construction (1) Spot the Errors

Instructions:

1. Watch the clips and spot as many errors as possible.
2. Describe the error in "Comments" (e.g. What is wrong with the way the person did the construction? What should he do instead.)

Complete the task by Saturday (29 July 2017), 10 pm so that we can review your work and discuss in the next lesson.


TASK 1
Watch the clip and try to spot as many errors as possible.




TASK 2
Watch the clip and try to spot as many errors as possible.

19 comments:

  1. This comment has been removed by the author.

    ReplyDelete
  2. Task 1:
    1. The angle bisector is not at the point of A
    2. He should draw two different arcs and place the compass on the arcs to find the angle bisector.

    Task 2:
    1. He should draw two different arcs at line A and C respectively.
    2. He should not enlarge his compass.
    3. He should place the compass on the arcs to find the angle bisector.

    ReplyDelete
  3. Task 1:
    1:Mr Rohitesh Mishra should have drawn the arc from point B,then draw the bisector
    Task 2:
    1:He should have drawn two arcs instead of one at line A and C
    2:He should not have enlarged the angle of the compass
    3:He should be drawing the bisector from the two arcs on line A and C

    ReplyDelete
  4. Task 1 (Errors):
    1. The angle bisector is not at the point of A
    2. He should draw two different arcs, that intersect.

    Task 2 (Errors):
    1. He should draw two different arcs at line A and C.
    2. He should not enlarge his compass, before drawing the second arc.

    ReplyDelete
  5. Task 1:
    The bisector did not intercept A

    Task 2:
    The compass was adjusted upon drawing the other arc, which made the whole construction an error.

    ReplyDelete
  6. Task 1:
    1) He should have drawn 2 different arcs and then place the compass on the arcs to find the angle bisector
    Task 2:
    1) He should not have drawn the 2 arcs at point A and C
    2) He should not have extended the compass
    3) He should have placed the compass on the arcs instead of point A and C

    ReplyDelete
  7. Task 1
    Errors:
    1. He place his compass on points A and C when drawing the guide lines for the angle bisector
    What should have been done:
    1. He should have drawn 2 arcs on the lines AB and BC from point B without changing the length of the compass. Then from the arcs that he has drawn, draw 2 arcs without changing the length of the compass, making the guide lines for the angle bisector

    Task 2
    Errors:
    1. He placed the compass at points A and C when drawing the guide lines for the angle bisector
    What should have been done:
    1. He should have placed his compass on the first he drew that is touching lines AB and BC and then draw the guide lines of the angle bisector without changing the length of the compass

    ReplyDelete
  8. Task 1:
    1. He did not mark the points at both arm of the angle- AB and BC but instead he draw the arc straight away from points B and C.
    Task 2
    1 When drawing the angle bisector, he shouldn't have enlarge the compass.

    ReplyDelete
  9. Task 1:
    1) He should have drawn 2 different arcs on the lines AB and BC.
    2) The angle bisector did not pass through point B.

    Task 2:
    1) The arcs should be drawn separately on the lines AB and BC
    2) The next 2 arcs should be drawn with the compass positioned at the arcs of AB and BC

    ReplyDelete
  10. Task 1
    1) He should have placed the sharp point of the compass on B, and then mark out 2 arcs on line AB and BC
    2) The line did not intercept angle ABC
    3)

    Task 2
    1) Line AB and BC should not share an arc it should be separate
    2) He should not have widened the compass
    3) The other arcs should be drawn with the compass positioned at the two separate arcs on line AB and BC

    ReplyDelete
  11. 1.) He should have drawn two different arcs instead of just drawing one
    2.) He did not place the compass at AB or BC

    1.)He was supposed to place the compass on the first arc when drawing a second arcs
    2.)

    ReplyDelete
  12. Task 1
    Errors:
    1.He place his compass on points A and C when it should have been placed on point B.
    Instead he should have placed in compass on point B and draw a pair of arcs on both lines BA and BC.
    2. He connected the two intercepting points of the pair of arcs that he drew.
    Instead he should have drawn another pair of arcs from where the first pair of arcs intercept lines BA and BC.
    3. The final line drawn does not start at point B.
    Instead the final line drawn should intercept point B
    Task 2:
    1.Line AB and BC share an arc.
    Instead it should have been separated into a pair of arcs
    2. He drew the arcs from points C and A
    Instead It should have been drawn from the arcs that intercept lines CB and BC.
    3. When drawing the second arc, he drew it two one over another.
    Instead he should have drawn the arcs only once to avoid misconception.

    ReplyDelete
  13. Task 1 :
    Errors :
    the compass should be placed on point B instead of B and C
    the angle bisector did not pass through angle ABC

    Task 2
    Errors :
    he expanded the compass when he was drawing a arc

    ReplyDelete
  14. Task 1 :
    Errors :
    the compass should be placed on point B instead of B and C
    the angle bisector did not pass through angle ABC

    Task 2
    Errors :
    he expanded the compass when he was drawing a arc

    ReplyDelete
  15. Task 1:
    He should have placed the compass on point B instead of point C
    The line did not intercept point ABC
    He should have drawn 2 arcs

    Task 2:
    He expanded the compass while drawing the arc
    Point A and c do not share an arc

    ReplyDelete
  16. Task 1:
    He is constructing a perpendicular bisector of AC and not an Angle bisector of angle ABC
    His line did not intersect point B
    His line did not separate angle ABC into 2 equal angles.

    Task 2:
    He drew the second arcs, from point A and C, and not from the first arc drawn.
    He should not enlarge his compass while drawing.

    ReplyDelete
  17. task 1:
    the compass should have been placed on point b instead of c
    the point did not intercept abc

    Task 2:
    the compass drawing is not accurate as it is too close to the drawing
    He should not expand his compass when drawing

    ReplyDelete
  18. Task 1: The bisector did not intercept A

    Task 2: The compass was moved when the arc was being drawn

    ReplyDelete
  19. Task 1 :
    Errors :
    The compass was wrongly placed which is supose to be only on b.


    Task 2
    Errors :
    He accidentally expanded the compass when he was drawing the arc which is an error.

    ReplyDelete

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