6th maths - common exam 2

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7 Terms

1
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How to find the centroid

  • get the midpoint of one line and the coordinates of the opposite corner

  • get the equation using these two

  • repeat for another line and corner

  • do simulatanous equations



2
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Circumcentre find it

  • perpendicular bisectors of all lines

  • midpoint of the side and the perpendicular slope

  • use these to get the equation of the line

  • repeat with another side

  • simulataneous equations



3
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Orthocentre

  • perpendicular slope of any line and the opposite corner

  • get the equation of the line

  • find this again for another side

  • simulataneous equations



4
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second difference formula

tn = an²+bn+c

2a = the second difference

5
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3rd difference formula

Tn=an³+bn²+cn+d
6a = 3rd difference

6
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how to get r

r=t(n+1)/tn

7
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how to get d

t(n+1) - tn = d