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Geometry

Our Discovering Quadrilaterals course is designed to elevate mastery in classification, structure and applications of all four-sided shapes. From Irregular Quadrilaterals to determining Double Diagonals of a Parallelogram, you will be prepared for more advanced concepts, such as Determining the Missing Angle of a Quadrilateral. Whether the focus is Parallelogram, Determining Side Length of a Parallelogram, or Rectangle Practice Problems, this course strengthens your understanding of the Quadrilateral.

- Introduction to Quadrilaterals
- Quadrilateral
- Quadrilaterals and Triangles
- Irregular Quadrilaterals
- Interior Angles of a Quadrilateral
- Determining the Missing Angle of a Quadrilateral
- Classifying Quadrilaterals
- Identifying Special Quadrilaterals
- Parallelogram
- The Diagonal of a Parallelogram
- Double Diagonals of a Parallelogram
- Perimeter of a Parallelogram
- Determining Side Length of a Parallelogram
- Determining Base or Height of a Parallelogram
- Rectangle
- The Diagonal of a Rectangle
- Double Diagonals of a Rectangle
- Perimeter of a Rectangle
- Rectangle Practice Problems
- Square
- The Diagonal of a Square
- Double Diagonals of a Square
- Perimeter of a Square
- Square Practice Problems
- Rhombus
- Diagonals of a Rhombus
- Perimeter of a Rhombus
- Determining the Side of a Rhombus from the Perimeter
- Rhombi Practice Problems
- Trapezoid
- Median Line of a Trapezoid
- Perimeter of a Trapezoid
- Base for a Parallelogram and Trapezoid
- Solving for the Perimeter of a Quadrilateral

Study fundamental topics in college-level algebra with emphasis on application.

Grasp core concepts of statistics such as probability distributions, approximations, and hypothesis-testing.

Pathways are a sequence of tutorials that help you learn a whole subject area, one concept at a time. Choose from multiple teachers and teaching styles.

The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 25 of Sophia's online courses for college credit. These courses are eligible to transfer to many different colleges and universities.