basic math formulas

• Arithmetic mean (average)

  Sum of values / Number of values
• Probability

  Target outcomes / Total outcomes
• Quadratic Formula


  x = −b ± √b²-4ac/2a
• Distance Formula


  d=√(x₁ – x₂)² + (y₁ – y₂)²
• Slope Formula

  Slope = y₂ – y₁ / x₂ – x₁
• Slope Intercept

  y=mx+b
• Midpoint Formula


  (x₁+x₂) / 2, (y₁+y₂) / 2
• Area of Triangle

  area = (1/2) (base) (height)
• Pythagorean Theorem

  a²+b²=c²
• Area of Rectangle


  area = length x width
• Area of Parallelogram


  area = base x height
• Area of Circle

  π * r²
• Circumference of Circle


  circumference = 2π * r
• Sine (SOH)


  Sine = opposite / hypotenuse
• Cosine (CAH)


  Cosine = adjacent / hypotenuse
• Tangent (TOA)

  Tangent = opposite / adjacent