SAT Math: Must-Know Formulas
Master the essential mathematical formulas tested on the SAT with this comprehensive flashcard deck. Covering key concepts from algebra, geometry, and trigonometry, these cards will help you quickly recall the formulas needed to solve a wide range of problems. Use them to solidify your foundational knowledge and boost your score on test day.
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What is slope-intercept form?
y = mx + b, where m is the slope and b the y-intercept.
How do you find slope from two points?
m = (y₂ − y₁) / (x₂ − x₁).
What is the quadratic formula?
x = (−b ± √(b² − 4ac)) / 2a.
What is the area of a triangle?
½ × base × height.
What is the area of a circle?
πr².
What is the circumference of a circle?
2πr, or πd.
What is the Pythagorean theorem?
a² + b² = c² for a right triangle with hypotenuse c.
What is the midpoint formula?
((x₁ + x₂)/2, (y₁ + y₂)/2).
How does a² − b² factor?
(a − b)(a + b).
What does SOH CAH TOA stand for?
Sine = opposite/hypotenuse, cosine = adjacent/hypotenuse, tangent = opposite/adjacent.
What is x^a · x^b?
x^(a+b).
What is (x^a)^b?
x^(ab).
What is the equation of a circle with center (h, k) and radius r?
(x − h)² + (y − k)² = r².
What are the side ratios of a 30-60-90 triangle?
x : x√3 : 2x, opposite the 30°, 60° and 90° angles.
What are the side ratios of a 45-45-90 triangle?
x : x : x√2.
How do you find a percent change?
(new − original) ÷ original × 100%.