Maths

• Upper quartile


  3/4 of the distribution
• Lower quartile


  1/4 of the distribution
• Interquartile range


  End of the lower quartile to beginning of upper quartile
• Cumulative frequency


  The running total
• Types of triangle (for congruency)


  • SAS
  • ASA
  • SSS
• Congruency


  When two shapes are exactly the same size
• Formula for circumference of a circle


  2πr
• Formula for radius of a circle 


  C/2π
• Formula for area of a circle 


  πr²
• Sin angle


  O/H
• Cos angle 


  A/H
• Tan angle


  O/A
• Missing angle in trig:


  shift sin/cos/tan (x ÷ y)
• Missing side in trig: 


  sin/cos/tan(angle) x side
• Trig formula for side when x is not on top

  number ÷ sin/cos/tan(angle)
• Pythagoras Hypotenuse 


  square root of a² + b²
• Pythagoras sides


  square root of a² - b²