IGCSE MATHS Doubts

[Ghost Of Highbury]

every square is a rhombus, because it's a quadrilateral with four
congruent (equal) sides.  But there are rhombuses that are not square,
because their angles are not right angles.

[Baladya]

question 21 b) please

and can u tell me what is a plane symmetry
and if u hv seen any other questions with plane symmetry in the past papers pls tell me

Thank You

A plane of symmetry is like the line of symmetry but for 3D shapes (i.e a cube)

http://www.m-a.org.uk/cabri/issue-02/files/cube-symmetry-one.jpg

So it just cuts it into two IDENTICAL halves

[haris94]

A plane of symmetry is like the line of symmetry but for 3D shapes (i.e a cube)

http://www.m-a.org.uk/cabri/issue-02/files/cube-symmetry-one.jpg

So it just cuts it into two IDENTICAL halves

ok Thanks  
im surprised i never knew that  

[diva_sparkles]

well actualy my teacher tht ths isnt in da syllabus!! n da examiners gav a mark 4 all da candidates as ths wasn in da syllabus!!

[Fastal]

2009 may/june

22c
i know the answer is probably staring at me in the face, but please tell me :/

[The Hitman]

umm, guys... can someone tell me the formula for quadratic equations?
i keep forgetting it...

[ksitna]

umm, guys... can someone tell me the formula for quadratic equations?
i keep forgetting it...

-b+-square root b squared-4ac
over 2a

[Adzel]

Its;
          [-b +or- sqaure root (b²-4ac)]/2a

[holtadit]

umm, guys... can someone tell me the formula for quadratic equations?
i keep forgetting it...

There's something called Google.com

[Adzel]

2009 may/june

22c
i know the answer is probably staring at me in the face, but please tell me :/

58

[haris94]

There's something called Google.com

lol
google.....the all knowing 

[Adzel]

@ ksitna: - Round your answer to three segnificant figiurs. e.g. your answer is 0.2356 ----> 0.236
              - Exept currency/money round it to two decimal points. e.g. your answer is $545.756 ----> $545.76

[haris94]

well actualy my teacher tht ths isnt in da syllabus!! n da examiners gav a mark 4 all da candidates as ths wasn in da syllabus!!

wow!!

now im hoping tomorrow v get a question out of the syllabus  

[ksitna]

@ ksitna: - Round your answer to three segnificant figiurs. e.g. your answer is 0.2356 ----> 0.236
              - Exept currency/money round it to two decimal points. e.g. your answer is $545.756 ----> $545.76

yup thx
and degrees to 1 decimal place:)

[Shazizzzle]

@ ksitna: - Round your answer to three segnificant figiurs. e.g. your answer is 0.2356 ----> 0.236
              - Exept currency/money round it to two decimal points. e.g. your answer is $545.756 ----> $545.76

And answers to angles, in degrees, to ONE decimal place, if not specified in the question itself.