ACT Math Formulas Flashcards
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| 698877015 | Average | Average = (sum of the terms)÷(number of terms) | |
| 698877016 | Quadratic Equation | x = [-b ± √(b²-4ac)]÷2a | |
| 698877017 | Distance Formula | d = √[(x₂-x₁)²+(y₂-y₁)²] | |
| 698877018 | Slope | (y₁-y₂)/(x₂-x₁) | |
| 698877019 | Slope-intercept Form | y = mx + b | |
| 698877020 | Interior Angles of a Polygon | Sum of the angles = (n-2) x 180 | |
| 698877021 | Perimeter of a Square | A = 4s | |
| 698877022 | Area of a Square | A = s² | |
| 698877023 | Area of a Triangle | A = ½×b×h | |
| 698877024 | Pythagorean Theorem | a² + b² = c² | |
| 698877025 | Perimeter of a Parallelogram | A = base x height | |
| 698877026 | Area of a Trapezoid | A = [(base₁ + base₂)/2] x height | |
| 698877027 | Equation for a Parabola | y = ax² + bx + c | |
| 698877028 | Equation of a Circle | (x-h)² + (y-k)² = r² (h,k) = circle center | |
| 698877029 | Circumference of a Circle | C = 2πr or C = dπ | |
| 698877030 | Area of a Circle | A = πr² | |
| 698877031 | Length of an Arc | Length of an Arc = (n/360) x 2πr | |
| 698877032 | Area of an Arc Sector | Area of a Sector = (n/360) x πr² | |
| 698877033 | Surface Area of Rectangular Solid | SA = 2lw + 2wh + 2lh | |
| 698877034 | Volume of Rectangular Solid | V = l x w x h | |
| 698877035 | Volume of a Cube | V = s³ | |
| 698877036 | Volume of a Cylinder | V = πr²h | |
| 698877039 | Volume of a Sphere | V = 4/3πr³ | |
| 698877041 | Sin(θ) | Sin(θ) = Opposite/Hypotenuse | |
| 698877043 | Cos(θ) | Cos(θ) = Adjacent/Hypotenuse | |
| 698877045 | Tan(θ) | Tan(θ) = Opposite/Adjacent | |
| 698877048 | Cotangent | 1/tangent | |
| 698877050 | Secant | 1/cosine | |
| 698877052 | Cosecant | 1/sine | |
| 698877053 | sin²x + cos²x | 1 | |
| 698877054 | Log Formula | y = log₂8 IF 2^y = 4 y = 3 | |
| 698877055 | Mid-Point Formula | (x₁ + x₂)/2, (y₁+y₂)/2 |