Getting Comfortable With the Unit Circle
Learn the unit circle: radians, the first-quadrant values, reference angles, signs in each quadrant, tangent, coterminal angles and the Pythagorean identity.
Study guides
Step-by-step guides to algebra, geometry, trigonometry, calculus, statistics and the SAT, with worked examples and practice problems. Plus study skills, and notes for teachers.
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Area, Surface Area and Volume, With Worked Problems
Every common area, surface area and volume formula in one place, plus composite shapes, unit conversions, scaling, and real-world problems with full solutions.
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How to Solve Linear Equations, Step by Step
Solve any linear equation: one-step and multi-step, variables on both sides, fractions and decimals, no-solution cases, and word problems, with worked examples.
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How to Study for a Math Test, Starting a Week Out
A practical plan for math test prep: gather problem types, practice from memory, keep an error log, space your review, and handle test day well.
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Solving Systems of Equations by Substitution, Elimination and Graphing
Solve systems of two linear equations by substitution, elimination or graphing, spot no-solution and infinite-solution systems, and set up word problems.
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How to Factor Any Polynomial
A reliable order for factoring: greatest common factor, trinomials, the ac method, difference of squares, cubes and grouping, with worked examples and practice.
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The Pythagorean Theorem, With Real Examples
Use a² + b² = c² to find a missing side, test whether a triangle is right, find distances on a graph, and recognize triples and special right triangles.
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What a Logarithm Is (and How the Log Rules Work)
What a logarithm means, the product, quotient, power and change-of-base rules, and how to solve exponential and log equations, with growth examples.
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SOH CAH TOA and Right-Triangle Trigonometry
How sine, cosine and tangent work in a right triangle, how to find a missing side or angle, angles of elevation, exact values, and complementary angles.
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What a Function Is, and How to Work With One
What a function is, how to read f(x), find domain and range, compose two functions, find an inverse, and shift a graph, with worked examples and practice.