On the real GED: This formula sheet is available to you during the entire math test. You do not need to memorize these formulas — you need to know which one to use and how to plug in the numbers correctly.
Area
| Square | A = s² |
| Rectangle | A = lw |
| Parallelogram | A = bh |
| Triangle | A = 12 bh |
| Trapezoid | A = 12 h(b₁ + b₂) |
| Circle | A = πr² |
Perimeter
| Square | P = 4s |
| Rectangle | P = 2l + 2w |
| Triangle | P = s₁ + s₂ + s₃ |
| Circle (circumference) | C = 2πr or C = πd (π ≈ 3.14) |
Surface Area & Volume
| Shape |
Surface Area |
Volume |
| Rectangular prism | SA = 2lw + 2lh + 2wh | V = lwh |
| Right prism | SA = ph + 2B | V = Bh |
| Cylinder | SA = 2πrh + 2πr² | V = πr²h |
| Pyramid | SA = 12ps + B | V = 13Bh |
| Cone | SA = πrs + πr² | V = 13πr²h |
| Sphere | SA = 4πr² | V = 43πr³ |
p = perimeter of base with area B | π ≈ 3.14
Data
Mean
mean is equal to the total of the values of a data set, divided by the number of elements in the data set
Median
median is the middle value in an odd number of ordered values of a data set, or the mean of the two middle values in an even number of ordered values in a data set
Algebra
| Slope of a line | m = y₂ − y₁x₂ − x₁ |
| Slope-intercept form | y = mx + b |
| Point-slope form | y − y₁ = m(x − x₁) |
| Quadratic equation | y = ax² + bx + c |
| Quadratic formula | x = −b ± √(b²−4ac)2a |
| Pythagorean theorem | a² + b² = c² |
| Simple interest | I = Prt |
| Distance formula | d = rt |
| Total cost | total cost = units × price per unit |