Geometry Course

Lesson 1 • Basic Geometric Constructions

Covers compass-and-straightedge techniques for copying and bisecting segments and angles. Reinforces definitions through hands-on construction.

Lesson 2 • Distance and the Coordinate Plane

Applies the distance formula and midpoint formula on the coordinate plane. Bridges abstract definitions to numerical computation.

Lesson 3 • Angles and Their Measurement

Introduces angle types, degree measure, and the protractor postulate. Connects measurement skills to later work on triangles and polygons.

Lesson 1 • Two-Column Proof Structure

Teaches the statement-reason format for organizing deductive arguments. Students practice writing complete proofs about segments and angles.

Lesson 2 • Inductive and Deductive Reasoning

Contrasts pattern-based conjecture with logical deduction. Establishes the reasoning framework applied in every proof in the course.

Lesson 3 • Postulates and Theorems

Distinguishes accepted postulates from proven theorems and explains how each functions in an argument. Builds the axiomatic foundation for all proofs.

Lesson 1 • Perpendicular Lines and Slopes

Defines perpendicularity and connects it to slope relationships on the coordinate plane. Prepares students for coordinate geometry proofs.

Lesson 2 • Proving Lines Parallel

Uses converse theorems to establish parallelism from angle evidence. Reinforces proof skills from Chapter 2 in a new context.

Lesson 3 • Properties of Parallel Lines

Identifies corresponding, alternate interior, and co-interior angle pairs. Connects these relationships to the parallel postulate.

Lesson 1 • Congruence Postulates and Theorems

Introduces SSS, SAS, ASA, AAS, and HL as tools for proving triangle congruence. Builds directly on proof skills from Chapter 2.

Lesson 2 • Triangle Classification and Angle Sums

Classifies triangles by sides and angles and proves the triangle angle-sum theorem. Establishes properties referenced in every subsequent triangle topic.

Lesson 3 • Triangle Inequalities

Establishes relationships between side lengths and angle measures within and between triangles. Prepares students for similarity and trigonometry.

Lesson 4 • CPCTC and Congruence Proofs

Uses corresponding parts of congruent triangles to prove additional segment and angle relationships. Extends proof-writing to multi-step arguments.

Lesson 1 • Indirect Measurement and Applications

Applies similarity to measure inaccessible distances using shadow and mirror methods. Demonstrates real-world relevance of proportional reasoning.

Lesson 2 • Similar Polygons

Defines similar polygons through congruent angles and proportional sides. Extends the concept beyond triangles to all polygon types.

Lesson 3 • Ratios, Proportions, and Scale

Reviews ratio and proportion skills and introduces scale factor as a measure of similarity. Provides the algebraic tools needed for all similarity work.

Lesson 4 • Proportionality Theorems

Covers the triangle proportionality theorem, its converse, and the midsegment theorem. Connects proportional reasoning to segment division.

Lesson 1 • Angles of Elevation and Depression

Applies trigonometric ratios to real-world height and distance problems. Develops problem-setup skills for applied geometry contexts.

Lesson 2 • The Pythagorean Theorem

Proves the Pythagorean theorem and its converse and classifies triangles by side lengths. Anchors all right-triangle computation in the chapter.

Lesson 3 • Special Right Triangles

Derives exact side ratios for 45-45-90 and 30-60-90 triangles. Provides efficient shortcuts used in trigonometry and coordinate geometry.

Lesson 4 • Law of Sines and Law of Cosines

Extends trigonometry to non-right triangles using the law of sines and cosines. Completes the toolkit for solving any triangle.

Lesson 1 • Polygon Angle-Sum Theorems

Derives interior and exterior angle-sum formulas for any convex polygon. Extends triangle angle reasoning to the general polygon case.

Lesson 2 • Inscribed and Circumscribed Polygons

Explores polygons inscribed in and circumscribed about circles and their special properties. Connects circle theorems to polygon properties from earlier sections.

Lesson 3 • Circle Vocabulary and Arc Measures

Introduces circle terminology and the relationship between central angles and arc measures. Establishes the vocabulary for all circle theorems.

Lesson 4 • Chord, Tangent, and Secant Theorems

Proves theorems about chords, tangents, and secants and their angle and segment relationships. Builds a complete set of circle-line interaction rules.

Lesson 1 • Surface Area of Solids

Calculates lateral and total surface area of prisms, pyramids, cylinders, and cones using nets. Develops spatial reasoning for three-dimensional figures.

Lesson 2 • Circumference and Area of Circles

Derives circumference and area formulas and applies them to sectors and segments. Connects circle measurement to arc and angle concepts from Chapter 7.

Lesson 3 • Similarity Ratios in Measurement

Applies perimeter, area, and volume ratios of similar figures to solve scaling problems. Synthesizes similarity from Chapter 5 with measurement from this chapter.

Lesson 4 • Volume of Solids

Derives and applies volume formulas for prisms, pyramids, cylinders, cones, and spheres. Connects Cavalieri's principle to volume derivation.