ACT Math Formulas: Printable Cheat Sheet to Memorize You must memorize a core set of ACT math formulas — the ACT provides no formula sheet on test day , covering six content areas students are expected to know cold. That single fact changes how you study. The good news: the list of truly high-yield formulas is shorter than most students expect. Start with these eight before anything else: Pythagorean theorem: a² + b² = c² Area of a circle: A = πr² Circumference: C = 2πr Slope formula: m = (y₂ − y₁) / (x₂ − x₁) Distance formula: d = √[(x₂ − x₁)² + (y₂ − y₁)²] Midpoint formula: M = ((x₁ + x₂)/2, (y₁ + y₂)/2) Area of a triangle: A = ½bh Volume of a rectangular solid: V = lwh Print this list and tape it somewhere visible. A one-page cheat sheet covering all topics is formatted later in this article — you can copy it into a document and print it before your next study session. One more thing before you dive in: calculators are allowed on the ACT, but every problem on the test can be solved without one. Use your calculator to check arithmetic and plug in answer choices — not to replace the conceptual steps that formulas handle. Key Takeaways The ACT provides no formula sheet, so memorizi