SAT Math · Chapter Test
Linear Functions — 25-Question Test
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Formula Reference Sheet
This chapter
Slope
| Slope formula | m = (y₂ − y₁)/(x₂ − x₁) |
|---|---|
| Meaning | rise over run; rate of change |
| Parallel lines | equal slopes |
| Perpendicular lines | slopes multiply to −1 |
Forms of a line
| Slope-intercept | y = mx + b |
|---|---|
| Point-slope | y − y₁ = m(x − x₁) |
| Standard | Ax + By = C |
| y-intercept | value of y when x = 0 |
Digital SAT reference
Area & Circumference
| Circle area | A = πr² |
|---|---|
| Circle circumference | C = 2πr |
| Rectangle | A = ℓw |
| Triangle | A = ½ b h |
Volume
| Rectangular box | V = ℓwh |
|---|---|
| Cylinder | V = πr²h |
| Sphere | V = 4⁄3 πr³ |
| Cone | V = 1⁄3 πr²h |
| Pyramid | V = 1⁄3 ℓwh |
Right triangles
| Pythagorean theorem | a² + b² = c² |
|---|---|
| 30°–60°–90° | sides x : x√3 : 2x |
| 45°–45°–90° | sides s : s : s√2 |
Constants
| Degrees in a circle | 360° |
|---|---|
| Radians in a circle | 2π |
| Angles of a triangle | sum = 180° |
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