High School Algebra & Geometry
A guided, multi-course journey that builds this skill from the ground up. Work through the chapters in order, or jump to any lesson.
Progress0%
Rewrite Expressions With Distribution and Like Terms (and Check by Substitution)Translate Words Into Algebra (Variables, Units, and Meaning)Solve One-Step and Two-Step Linear Equations (Including Fractions)Solve Multi-Step Linear Equations With Distribution and Collecting TermsEquations With Variables on Both Sides (No Solution vs. Infinitely Many)Proportions and Rates: Set Up the Equation, Track UnitsLinear Inequalities: Solve, Graph, and Use Interval NotationCompound Inequalities (“And” / “Or”) and Correct Solution SetsError Repair: Negatives, Moving Terms, and the Inequality Sign Flip
Points and Intercepts in ContextSlope as Rate of ChangeGraphing Lines From Equations and From a Point Plus SlopeWriting Linear Equations From a Graph, Two Points, and a TablePoint-Slope Form and Converting to Slope-Intercept FormFunction Notation, Evaluation, and Reasonable Domain and RangeModeling Linear Word Problems and a SAT-Style Mixed Checkpoint
Systems From Word Problems: Two Constraints, One SolutionSolving Systems by Graphing: One, None, or Infinitely Many SolutionsSolving Systems by Substitution (and Checking Both Equations)Elimination and Method Choice: Multiply, Add/Subtract, Interpret CancellationsExponents, Scientific Notation, and Polynomial Operations
Reading Geometry Diagrams: Notation, Markings, and What You Can’t AssumeCompass-and-Straightedge Constructions You Actually UseVertical Angles and Linear Pairs: The First Angle Facts You Can JustifyComplementary and Supplementary Angles With AlgebraParallel Lines and a Transversal: Corresponding and Alternate Interior AnglesTransformations on the Coordinate Plane: Translations, Reflections, Rotations, and Dilations
Triangle Inequality and Angle Sum: Solving and Detecting Impossible TrianglesThe Exterior Angle Theorem in Triangle Angle-ChasingTriangle Correspondence: Matching Vertices Before You Prove AnythingChoosing SSS, SAS, ASA, or AAS: When Is Congruence Guaranteed?HL Congruence and the SSA Trap in Right TrianglesWriting, Completing, and Debugging Congruence Proofs With CPCTC
Angle Sums in Polygons and Key Quadrilateral PropertiesCore Circle Measures: Circumference, Area, and Pi DisciplineCircle Theorems in Diagrams: Central vs. Inscribed Angles, Chords, and TangentsArea of Plane Figures and Composite Areas (Including Scale Factor Effects)Surface Area and Volume of Solids With Unit Conversions (Mixed Review)