important formulas

• Area of a rectangle formula?

  Length x Width
• Area of parallelogram formula?

  Base x height
• Area of triangle formula?

  1/2 b x h
• Trig ratios

  Sin: opp/hyp

  Cos: adj/hyp

  Tan: opp/adj
• Volume of cuboid formula?

  length x width x height
• Volume of cylinder formula?

  pi x radius^2 x h
• Volume of pyramid formula?

  1/3 x area of base x height
• Speed equation?

  Speed=distance/time
• Density equation?

  Density=mass/volume
• Pressure equation?

  Pressure=force/area
• Volume of a cone formula

  1/3 πr^2 h
• sector area

  (θ/360) x πr^2
• Arc length

  (θ/360) x π x d
• equation of a line

  y = mx+c
• sine rule (length)

  a/sin A = b/sin B = c/sin C
• sine rule angles

  sin A/a = sin B/b = sin C/c
• cosine rule (length)

  a^2 = b^2 + c^2 - 2bc cos A
• cosine rule (angles)

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