tag:blogger.com,1999:blog-3677029225189158813.post8440745032366785392..comments2017-09-28T22:02:59.575+08:00Comments on 2017 S1-07 MATHEMATICS: Geometrical Construction (1) Spot the ErrorsNur Johari Bin Sallehnoreply@blogger.comBlogger19125tag:blogger.com,1999:blog-3677029225189158813.post-28140729519123219582017-07-31T09:50:28.675+08:002017-07-31T09:50:28.675+08:00Task 1 :
Errors :
The compass was wrongly placed w...Task 1 :<br />Errors :<br />The compass was wrongly placed which is supose to be only on b.<br /><br /><br />Task 2<br />Errors :<br />He accidentally expanded the compass when he was drawing the arc which is an error. Bryan Tan Kai Kiathttps://www.blogger.com/profile/01627585015154965183noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-25858058554213599642017-07-31T09:49:32.295+08:002017-07-31T09:49:32.295+08:00Task 1: The bisector did not intercept A
Task 2: ...Task 1: The bisector did not intercept A<br /><br />Task 2: The compass was moved when the arc was being drawnganlekhenghttps://www.blogger.com/profile/10536499210170638270noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-8366292949398841512017-07-31T07:19:58.231+08:002017-07-31T07:19:58.231+08:00task 1:
the compass should have been placed on po...task 1: <br />the compass should have been placed on point b instead of c<br />the point did not intercept abc<br /><br />Task 2:<br />the compass drawing is not accurate as it is too close to the drawing<br />He should not expand his compass when drawingTimothy Luk Wan Tenghttps://www.blogger.com/profile/11937307255878033973noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-14627742204508374022017-07-30T21:53:03.414+08:002017-07-30T21:53:03.414+08:00Task 1:
He is constructing a perpendicular bisecto...Task 1:<br />He is constructing a perpendicular bisector of AC and not an Angle bisector of angle ABC<br />His line did not intersect point B<br />His line did not separate angle ABC into 2 equal angles.<br /><br />Task 2:<br />He drew the second arcs, from point A and C, and not from the first arc drawn.<br />He should not enlarge his compass while drawing.Tan Jeng Khiang Damienhttps://www.blogger.com/profile/02863277013468122393noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-85790275337207848292017-07-30T20:29:00.898+08:002017-07-30T20:29:00.898+08:00Task 1:
He should have placed the compass on point...Task 1:<br />He should have placed the compass on point B instead of point C<br />The line did not intercept point ABC<br />He should have drawn 2 arcs<br /><br />Task 2: <br />He expanded the compass while drawing the arc<br />Point A and c do not share an arc<br />Peh Wei Ting Audreyhttps://www.blogger.com/profile/13050925130279580262noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-57883932043104099402017-07-30T18:00:35.293+08:002017-07-30T18:00:35.293+08:00Task 1 :
Errors :
the compass should be placed o...Task 1 : <br />Errors : <br />the compass should be placed on point B instead of B and C <br />the angle bisector did not pass through angle ABC<br /><br />Task 2 <br />Errors : <br />he expanded the compass when he was drawing a arc Wesley yephttps://www.blogger.com/profile/00774256575841668031noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-35287691042585236352017-07-30T18:00:09.280+08:002017-07-30T18:00:09.280+08:00Task 1 :
Errors :
the compass should be placed o...Task 1 : <br />Errors : <br />the compass should be placed on point B instead of B and C <br />the angle bisector did not pass through angle ABC<br /><br />Task 2 <br />Errors : <br />he expanded the compass when he was drawing a arc Wesley yephttps://www.blogger.com/profile/00774256575841668031noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-53911008777378225602017-07-30T17:49:36.099+08:002017-07-30T17:49:36.099+08:00Task 1
Errors:
1.He place his compass on points A ...Task 1<br />Errors:<br />1.He place his compass on points A and C when it should have been placed on point B.<br />Instead he should have placed in compass on point B and draw a pair of arcs on both lines BA and BC.<br />2. He connected the two intercepting points of the pair of arcs that he drew. <br />Instead he should have drawn another pair of arcs from where the first pair of arcs intercept lines BA and BC.<br />3. The final line drawn does not start at point B. <br />Instead the final line drawn should intercept point B<br />Task 2:<br />1.Line AB and BC share an arc.<br />Instead it should have been separated into a pair of arcs<br />2. He drew the arcs from points C and A<br />Instead It should have been drawn from the arcs that intercept lines CB and BC.<br />3. When drawing the second arc, he drew it two one over another.<br />Instead he should have drawn the arcs only once to avoid misconception.<br /><br />SeahWeiNinghttps://www.blogger.com/profile/04241059215515840373noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-20173971026369878582017-07-30T16:03:47.260+08:002017-07-30T16:03:47.260+08:001.) He should have drawn two different arcs instea...1.) He should have drawn two different arcs instead of just drawing one <br />2.) He did not place the compass at AB or BC <br /><br />1.)He was supposed to place the compass on the first arc when drawing a second arcs<br />2.)Ng Zen Haanhttps://www.blogger.com/profile/05520268727335952891noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-53460239187783261062017-07-30T16:00:56.301+08:002017-07-30T16:00:56.301+08:00Task 1
1) He should have placed the sharp point o...Task 1 <br />1) He should have placed the sharp point of the compass on B, and then mark out 2 arcs on line AB and BC<br />2) The line did not intercept angle ABC<br />3) <br /><br />Task 2<br />1) Line AB and BC should not share an arc it should be separate<br />2) He should not have widened the compass<br />3) The other arcs should be drawn with the compass positioned at the two separate arcs on line AB and BCKow Hsu Hweehttps://www.blogger.com/profile/08626667079760689381noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-14155290938079272012017-07-30T14:48:07.171+08:002017-07-30T14:48:07.171+08:00Task 1:
1) He should have drawn 2 different arcs o...Task 1:<br />1) He should have drawn 2 different arcs on the lines AB and BC.<br />2) The angle bisector did not pass through point B.<br /><br />Task 2:<br />1) The arcs should be drawn separately on the lines AB and BC<br />2) The next 2 arcs should be drawn with the compass positioned at the arcs of AB and BC Seow Kit Hinthttps://www.blogger.com/profile/01348275940761114046noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-13086160816549246492017-07-30T12:50:37.273+08:002017-07-30T12:50:37.273+08:00Task 1:
1. He did not mark the points at both arm ...Task 1:<br />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.<br />Task 2 <br />1 When drawing the angle bisector, he shouldn't have enlarge the compass.<br /><br />Roystonhttps://www.blogger.com/profile/01711328626802843995noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-20571349529661950792017-07-30T12:26:09.898+08:002017-07-30T12:26:09.898+08:00Task 1
Errors:
1. He place his compass on points ...Task 1<br />Errors: <br />1. He place his compass on points A and C when drawing the guide lines for the angle bisector<br />What should have been done:<br />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<br /><br />Task 2<br />Errors:<br />1. He placed the compass at points A and C when drawing the guide lines for the angle bisector<br />What should have been done:<br />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 compassAdabel Teoh Yujiahttps://www.blogger.com/profile/13146127123390886530noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-45459583472835675852017-07-30T11:23:02.182+08:002017-07-30T11:23:02.182+08:00Task 1:
1) He should have drawn 2 different arcs a...Task 1:<br />1) He should have drawn 2 different arcs and then place the compass on the arcs to find the angle bisector<br />Task 2: <br />1) He should not have drawn the 2 arcs at point A and C<br />2) He should not have extended the compass<br />3) He should have placed the compass on the arcs instead of point A and CShaun Hohttps://www.blogger.com/profile/11736033108536061037noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-15033918744674751242017-07-30T11:09:46.910+08:002017-07-30T11:09:46.910+08:00Task 1:
The bisector did not intercept A
Task 2:
...Task 1:<br />The bisector did not intercept A<br /><br />Task 2:<br />The compass was adjusted upon drawing the other arc, which made the whole construction an error.Hansen Weehttps://www.blogger.com/profile/00528673343970052616noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-36910470964720039572017-07-30T11:04:24.008+08:002017-07-30T11:04:24.008+08:00Task 1 (Errors):
1. The angle bisector is not at ...Task 1 (Errors): <br />1. The angle bisector is not at the point of A<br />2. He should draw two different arcs, that intersect.<br /><br />Task 2 (Errors):<br />1. He should draw two different arcs at line A and C.<br />2. He should not enlarge his compass, before drawing the second arc.Ng Yong Kiat Shawnhttps://www.blogger.com/profile/02407929878322208843noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-9626084158082198002017-07-30T09:39:46.491+08:002017-07-30T09:39:46.491+08:00Task 1:
1:Mr Rohitesh Mishra should have drawn the...Task 1:<br />1:Mr Rohitesh Mishra should have drawn the arc from point B,then draw the bisector<br />Task 2:<br />1:He should have drawn two arcs instead of one at line A and C<br />2:He should not have enlarged the angle of the compass<br />3:He should be drawing the bisector from the two arcs on line A and CRyanhttps://www.blogger.com/profile/17919729507430523107noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-12606356568306315202017-07-29T15:21:21.180+08:002017-07-29T15:21:21.180+08:00Task 1:
1. The angle bisector is not at the point...Task 1: <br />1. The angle bisector is not at the point of A<br />2. He should draw two different arcs and place the compass on the arcs to find the angle bisector.<br /><br />Task 2:<br />1. He should draw two different arcs at line A and C respectively.<br />2. He should not enlarge his compass.<br />3. He should place the compass on the arcs to find the angle bisector.<br />Yeo Teng Junhttps://www.blogger.com/profile/13016368717867198404noreply@blogger.comtag:blogger.com,1999:blog-3677029225189158813.post-41582593402948370452017-07-29T10:10:29.913+08:002017-07-29T10:10:29.913+08:00This comment has been removed by the author.Ng Yong Kiat Shawnhttps://www.blogger.com/profile/02407929878322208843noreply@blogger.com