Formulas

• Area of a Cubiod

  Surface area = 2lengthxwidth + 2widthxheight + 2lengthxheight
• Volume of a Cubiod

  Volume= length × width × height.
• Surface Area of a Cone

   Surface area=πr(r + l)
• Volume of a cone

  volume = (1/3) × π × r² × h.
• Surface area of a cylinder


  Surface area=2πr(r + h)
• Volume of a cylinder

  Volume=πr^2 h
• Completing the square

  (x+b/2)^2-(b/2)^2+c
• Surface area of a prism


  Surface area= (2 × Base Area) + (Base perimeter × height)
• Volume of a prism

  first calculate the area of the cross-section. Then multiply the area of the cross-section by the length.
• When to use Sine rule?

  when we are given either a) two angles and one side, or b) two sides and a non-included angle
• When to use cosine rule?

   when we are given either a) three sides or b) two sides and the included angle.
• Sine rule


  SinA/a = SinB/b + SinC/c
• Cosine rule

  $a^2 =$$b^2 +$$c^2 -2bc cos(A)$