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ACT Math Formulas Flashcards

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698877015AverageAverage = (sum of the terms)÷(number of terms)
698877016Quadratic Equationx = [-b ± √(b²-4ac)]÷2a
698877017Distance Formulad = √[(x₂-x₁)²+(y₂-y₁)²]
698877018Slope(y₁-y₂)/(x₂-x₁)
698877019Slope-intercept Formy = mx + b
698877020Interior Angles of a PolygonSum of the angles = (n-2) x 180
698877021Perimeter of a SquareA = 4s
698877022Area of a SquareA = s²
698877023Area of a TriangleA = ½×b×h
698877024Pythagorean Theorema² + b² = c²
698877025Perimeter of a ParallelogramA = base x height
698877026Area of a TrapezoidA = [(base₁ + base₂)/2] x height
698877027Equation for a Parabolay = ax² + bx + c
698877028Equation of a Circle(x-h)² + (y-k)² = r² (h,k) = circle center
698877029Circumference of a CircleC = 2πr or C = dπ
698877030Area of a CircleA = πr²
698877031Length of an ArcLength of an Arc = (n/360) x 2πr
698877032Area of an Arc SectorArea of a Sector = (n/360) x πr²
698877033Surface Area of Rectangular SolidSA = 2lw + 2wh + 2lh
698877034Volume of Rectangular SolidV = l x w x h
698877035Volume of a CubeV = s³
698877036Volume of a CylinderV = πr²h
698877039Volume of a SphereV = 4/3πr³
698877041Sin(θ)Sin(θ) = Opposite/Hypotenuse
698877043Cos(θ)Cos(θ) = Adjacent/Hypotenuse
698877045Tan(θ)Tan(θ) = Opposite/Adjacent
698877048Cotangent1/tangent
698877050Secant1/cosine
698877052Cosecant1/sine
698877053sin²x + cos²x1
698877054Log Formulay = log₂8 IF 2^y = 4 y = 3
698877055Mid-Point Formula(x₁ + x₂)/2, (y₁+y₂)/2

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