actual revision

• What does it mean if the discriminant is greater than 0?

  There are 2 real and distinct roots
• What is the relationship between angles in a triangle?

  Sum of angles equals 180 degrees
• How do you calculate the median of a data set?

  Arrange data and find the middle value
• What is the formula for the interquartile range?

  Upper quartile - Lower quartile
• What are the trigonometric ratios represented by SOH CAH TOA?

  • SOH: Sine = Opposite/Hypotenuse
  • CAH: Cosine = Adjacent/Hypotenuse
  • TOA: Tangent = Opposite/Adjacent
• What is the formula for calculating $\theta$ in the equation $\frac{15}{\pi \times 24} =$$\theta$?


  $\theta =$$\frac{15 \times 360}{\pi \times 24}$
• what do you put into y = (x + p)^2 + q?

  the turning point
• you can't use pythagorus if there is no right angle
• when do you use cosA=b^2+c^2-a^2 ÷ 2bc

  when you are searching for the angle - given all 3 sides
• when do u use a^2 = b^2+c^2-2bc x cosA

  when you are looking for another side - given 2 sides and an angle
• y - b = m(x-a) can also be said as

  y - y^1 = m (x - x1)
• how do you rationalise denominator in surds?

  times both half's of a fraction by the denominator
• when multiplying indices you add them
• when dividing indices you subtract them
• co-ordinates are (x,y)
• sin graphs go up and then down
• cos graphs just go down
• celia payed 45000 on rent this year which is an 11% increase since last year. what would she have payed last year?

  100% - 11%

  45000 x 89%
• how do you continue 7/sin25 = 10/sinK

  7sinK = 10 x sin25

  sinK = (10 x sin 25) ÷ 7
• when do you use sin^-1?


  when switching the equation to the sin side and the x on its own
• How do you work out 3x^2 + 8x + 1?

  quadratic formula
• what does c stand for in Pythagoras?


  c
• when do you use sin rule?

  2 angles and 1 or 2 sides
• when do you use cos rule?

  when sin cant work - to find side or angle
• what do you do when: $5\sqrt{3\ }-\sqrt{3}$


  $4\sqrt{3}$
• when using sin / cos graphs what does the 2 and 3 stand for? $y\ =$$\ 2\sin3x$


  2 = how high

  3 = how many times repeated
• $\frac{a}{\sin A}=$$\frac{b}{\sin B}=$$\frac{c}{\sin C}$ is used to find the missing side
• $\frac{\sin A}{a}=$$\frac{\sin B}{b}=$$\frac{\sin C}{c}$ is used to find missing angle
• what do you need to figure out if you need sin rule?

  you need 2 opposites from a triangle

  (e.g. 1 angle and 2 sides opposite each other)