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Geometry, Comprehensive Level, Part 1 (MTH203A)

Geometry, Comprehensive Level, Part 1 (MTH203A)

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Quick Overview

In this comprehensive high school math course, students are challenged to recognize and work with geometric concepts in various contexts. They build on ideas of inductive and deductive reasoning, logic, concepts, and techniques of Euclidean plane and solid geometry. They develop deeper understandings of mathematical structure, method, and applications of Euclidean plane and solid geometry. Students use visualizations, spatial reasoning, and geometric modeling to solve problems.

Teacher-Led Course (one-time payment)   $450.00

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Course Overview

Students learn to recognize and work with geometric concepts in various contexts. They build on ideas of inductive and deductive reasoning, logic, concepts, and techniques of Euclidean plane and solid geometry and develop an understanding of mathematical structure, method, and applications of Euclidean plane and solid geometry. Students use visualizations, spatial reasoning, and geometric modeling to solve problems. Topics of study include points, lines, and angles; triangles; right triangles; quadrilaterals and other polygons; circles; coordinate geometry; three-dimensional solids; geometric constructions; symmetry; the use of transformations; and non-Euclidean geometries.

Compared to MTH202, this course has a more rigorous pace and more challenging assignments and assessments. MTH203 also covers additional topics such biconditionals, rotations of points in a coordinate plane, creating and interpreting truth tables, parametric equations for lines in three dimensions, finding the equation of a circle from three points, input-output tables for logical gates, and several theorems including the Jordan Curve Theorem, Pappus' Theorem, and Desargues' Theorem.

Course Outline


Unit 1: An Introduction

Even the longest journey begins with a single step. Any journey into the world of geometry begins with the basics. Points, lines, segments, and angles are the foundation of geometric reasoning. This unit provides you with basic footing that will lead to an understanding of geometry.

  • Semester Introduction
  • Basic Geometric Terms and Concepts
  • Measuring Length
  • Measuring Angles
  • Bisectors and Line Relationships
  • Relationships between Triangles and Circles
  • Transformations
  • Using Algebra to Describe Geometry

Unit 2: Methods of Proof and Logic

Professionals use logical reasoning in a variety of ways. Just as lawyers use logical reasoning to formulate convincing arguments, mathematicians use logical reasoning to formulate and prove theorems. With definitions, assumptions, and previously proven theorems, mathematicians discover and prove new theorems. It's like building a defense, one argument at a time. In this unit, you will learn how to build a defense from postulates, theorems, and sound reasoning.

  • Reasoning, Arguments, and Proof
  • Conditional Statements
  • Compound Statements and Indirect Proof
  • Definitions and Biconditionals
  • Algebraic Logic
  • Inductive and Deductive Reasoning

Unit 3: Polygon Basics

Students can find polygons in many places: artwork, sporting events, architecture, and even in roads. In this unit, you will discover symmetry, work with special quadrilaterals, and work with parallel lines and slopes.

  • Polygons and Symmetry
  • Quadrilaterals and Their Properties
  • Parallel Lines and Transversals
  • Converses of Parallel Line Properties
  • The Triangle Sum Theorem
  • Angles in Polygons
  • Midsegments
  • Slope

Unit 4: Congruent Polygons and Special Quadrilaterals

If two algebraic expressions are equivalent, they represent the same value. What about geometric shapes? What does it mean for two figures to be equivalent? A pair of figures can be congruent the same way that a pair of algebraic expressions can be equivalent. You will learn, use, and prove theorems about congruent geometric figures.

  • Congruent Polygons and Their Corresponding Parts
  • Triangle Congruence: SSS, SAS, and ASA
  • Isosceles Triangles and Corresponding Parts
  • Triangle Congruence: AAS and HL
  • Using Triangles to Understand Quadrilaterals
  • Types of Quadrilaterals
  • Constructions with Polygons
  • The Triangle Inequality Theorem

Unit 5: Perimeter, Area, and Right Triangles

If you have a figure, you can take many measurements and calculations. You can measure or calculate the distance around the figure (the perimeter or circumference), as well as the figure's height and area. Even if you have just a set of points, you can measure or calculate the distance between two points.

  • Perimeter and Area
  • Areas of Triangles and Quadrilaterals
  • Circumference and Area of Circles
  • The Pythagorean Theorem
  • Areas of Special Triangles and Regular Polygons
  • Using the Distance Formula
  • Proofs and Coordinate Geometry

Unit 6: Semester Review and Test

  • Semester Review
  • Semester Test


Unit 1: Three-Dimensional Figures and Graphs

One-dimensional figures, such as line segments, have length. Two-dimensional figures, such as circles, have area. Objects we touch and feel in the real world are three-dimensional; they have volume.

  • Semester Introduction
  • Solid Shapes and Three-Dimensional Drawing
  • Lines, Planes, and Polyhedra
  • Prisms
  • Coordinates in Three Dimensions
  • Equations of Lines and Planes in Space

Unit 2: Surface Area and Volume

Every three-dimensional figure has surface area and volume. Some figures are more common and useful than others. You probably see pyramids, prisms, cylinders, cones, and spheres every day. In this unit, you will learn how to calculate the surface area and volume of several common and useful three-dimensional figures.

  • Surface Area and Volume
  • Surface Area and Volume of Prisms
  • Surface Area and Volume of Pyramids
  • Surface Area and Volume of Cylinders
  • Surface Area and Volume of Cones
  • Surface Area and Volume of Spheres
  • Three-Dimensional Symmetry

Unit 3: Similar Shapes

A map of a city has the same shape as the original city, but the map is much, much smaller. A mathematician would say that the map and the city are similar. They have the same shape but are different sizes.

  • Dilations and Scale Factors
  • Similar Polygons
  • Triangle Similarity
  • Side-Splitting Theorem
  • Indirect Measurement and Additional Similarity Theorems
  • Area and Volume Ratios

Unit 4: Circles

Students probably know what a circle is and what the radius and diameter of a circle represent. However, a circle can have many more figures associated with it. Arcs, chords, secants, and tangents all provide a rich set of figures to draw, measure, and understand.

  • Chords and Arcs
  • Tangents to Circles
  • Inscribed Angles and Arcs
  • Angles Formed by Secants and Tangents
  • Segments of Tangents, Secants, and Chords
  • Circles in the Coordinate Plane

Unit 5: Trigonometry

Who uses trigonometry? Architects, engineers, surveyors, and many other professionals use trigonometric ratios such as sine, cosine, and tangent to compute distances and understand relationships in the real world.

  • Tangents
  • Sines and Cosines
  • Special Right Triangles
  • The Laws of Sines and Cosines

Unit 6: Beyond Euclidian Geometry

Some people break rules, but mathematicians are usually very good at playing by them. Creative problem-solvers, including mathematicians, create new rules, and then play by their new rules to solve many kinds of problems.

  • The Golden Rectangle
  • Taxicab Geometry
  • Graph Theory
  • Topology
  • Spherical Geometry
  • Fractal Geometry
  • Projective Geometry
  • Computer Logic

Unit 7: Semester Review and Test

  • Semester Review
  • Semester Test

Additional Information

Course Length 4 Months
Prerequisites N/A
Course Materials

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Standard Kits

STANDARD kits contain K12 course materials that are required for completion of the course.  These kits include K12 authored materials and/or difficult to procure materials that a student needs to complete a course. Printed reference guides are not included in Standard kits.


CONSUMABLE kits contain only those materials from the standard kit that are intended for one time use. Families who purchase a Standard kit for Child A could later purchase a Consumable kit for Child B to complete the same course.


Offered for added convenience, ADDITIONAL kits contain easily obtained materials needed for the course which a family may already have in their home. 

Coach and/or Student Reference Guides are available for purchase with some courses.  Electronic versions of these reference guides are also available within digital courses.

Course Start Date

Courses Taught by a K12 Teacher

Courses with a teacher have designated start dates throughout Fall, Spring, and Summer. Full-year courses last 10 months and semester courses last 4 months. Courses are taught by teachers in K12 International Academy. For details on start dates, click here.

Teacher Assisted Yes, this course is taught by a K12 International Academy teacher. If you are looking for a teacher-supported option with additional flexibility and year-round start dates, click here to learn about the Keystone School, another K12 online private schooling option.
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  • RAM: 1GB of RAM

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  • At this time our users are encouraged not to upgrade to Windows 10 or Edge (the new browser)


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  • RAM: 1GB of RAM

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