Lesson & Activity Hub
Choose a lesson. Each lesson page has an overview of the main ideas, the lesson notes, the lesson video, any interactive activity for the lesson, and practice problems with feedback.
Foundations
Points, lines, planes, segments, and angles — the building blocks of geometry.
Vocabulary flash cards: Basics of Geometry — Flash Cards (PDF) · Print 2-sided, flipped on the long edge.
- Points, Lines, and Planes + Interactive Activity Open ›
- Measuring Segments + Interactive Activity Open ›
- Pythagorean Theorem + Interactive Activity Open ›
- Segment Addition + Interactive Activity Open ›
- Midpoint Formula + Interactive Activity Open ›
- Segment Bisector + Interactive Activity Open ›
- Partitioning a Directed Line Segment + Interactive Activity Open ›
- Angle Measurement + Interactive Activity Open ›
- Angle Relationships + Interactive Activity Open ›
Reasoning and Proof
Conditional statements, reasoning, and your first proofs.
Vocabulary flash cards: Reasoning and Proofs — Flash Cards (PDF) · Print 2-sided, flipped on the long edge.
Parallel Lines and Slope
Angle pairs formed by a transversal, proving lines parallel, and slope.
Vocabulary flash cards: Parallel and Perpendicular Lines — Flash Cards (PDF) · Print 2-sided, flipped on the long edge.
- Parallel Lines, Transversals, Angle Pair Relationships + Interactive Activity Open ›
- City Map Activity Practice Activity Open ›
- Proving Lines Parallel + Interactive Activity Open ›
- Slope, Parallel & Perpendicular Lines + Interactive Activity Open ›
- Distance Between Two Parallel Lines + Interactive Activity Open ›
Triangles and Congruence
Classifying triangles and proving triangles congruent.
Vocabulary flash cards: Congruent Triangles — Flash Cards (PDF) · Print 2-sided, flipped on the long edge.
- Classifying Triangles + Interactive Activity Open ›
- Measuring Angles in Triangles + Interactive Activity Open ›
- Exploring Congruent Triangles + Interactive Activity Open ›
- Proving Triangles Congruent + Interactive Activity Open ›
- Triangle Proofs + Interactive Activity Open ›
- Triangle Congruence Proofs Practice Activity Open ›
Transformations
Translations, reflections, rotations, and dilations.
Vocabulary flash cards: Transformations — Flash Cards (PDF) · Print 2-sided, flipped on the long edge.
Right Triangles and Trigonometry
The Pythagorean Theorem, special right triangles, and trigonometry in right triangles.
Vocabulary flash cards: Right Triangles and Trigonometry — Flash Cards (PDF) · Print 2-sided, flipped on the long edge.
- Pythagorean Theorem and its Converse + Interactive Activity Open ›
- Special Right Triangles + Interactive Activity Open ›
- Trigonometry (Right Triangles) + Interactive Activity Open ›
- Inverse Trigonometry (Right Triangles) + Interactive Activity Open ›
- Angles of Elevation and Depression + Interactive Activity Open ›
Triangle Relationships
Special segments and inequalities within triangles.
Vocabulary flash cards: Special Segments and Inequalities Within Triangles — Flash Cards (PDF) · Print 2-sided, flipped on the long edge.
- Midsegment of a Triangle + Interactive Activity Open ›
- Perpendicular Bisector + Interactive Activity Open ›
- Angle Bisector + Interactive Activity Open ›
- Medians in Triangles + Interactive Activity Open ›
- Altitudes + Interactive Activity Open ›
- Inequalities in a Triangle + Interactive Activity Open ›
- Inequalities Involving Two Triangles + Interactive Activity Open ›
- Triangle Inequality Theorem + Interactive Activity Open ›
Similarity
Similar polygons and triangles, and proportional parts.
Quadrilaterals and Polygons
Parallelograms, rectangles, rhombuses, squares, trapezoids, kites, and polygons.
Vocabulary flash cards: Quadrilaterals and Other Polygons — Flash Cards (PDF) · Print 2-sided, flipped on the long edge.
Circles
Arcs, chords, angles, circumference, and equations of circles.
Vocabulary flash cards: Circles — Flash Cards (PDF) · Print 2-sided, flipped on the long edge.
Area and Probability
Area and perimeter of figures, probability, and geometric probability.
Vocabulary flash cards: Circumference, Area, and Volume — Flash Cards (PDF) · Print 2-sided, flipped on the long edge.
Volume and Surface Area
Volume and surface area of solid figures.
Vocabulary flash cards: Circumference, Area, and Volume — Flash Cards (PDF) · Print 2-sided, flipped on the long edge.