formulae

• What is the formula for the discriminant?

  $b^2 - 4ac$
• what do you use to determine the nature of the roots?

  the discriminate
• when calculating y on gradient

  y-y^1=m(x-x^1)
• how do u calculate gradient?

  y^2 - y^1 ÷ x^2 - x^1
• arc length ÷ Circumference = sector length ÷ 360
• what is the area of a sector?

  angle / 360 x pie r^2
• what is the formula of Pythagoras?

  $a^2+$$b^2=$$c^2$
• what is the formula of straight line?

  y = mx + c